CCTV System for Radiation Work Management

Yonggwang NPP Unit 5 & 6

Contents

Ⅰ. YGN Unit 5 & 6

Ⅱ. Brief Overview of Radiation Protection

Ⅲ. Description of CCTV system

Ⅳ. Cases for use of CCTV system

Ⅴ. Effects

Ⅵ. IAEA OSART Good Practice

Ⅶ. Conclusion

Type : PWR Power Level : 1,050MWe 2 Loops, 2 S/Gs, 4 RCPs 177 Fuel Assy’s, 16 × 16 tubes S/G : Vertical U-tube with

Economizer Condenser Heat Sink : Sea water

□ Key Features

Ⅰ. YGN Unit 5 & 6

Ⅱ. Brief Overview of Radiation protection

□ Statutory Exposure Dose limit

Category Workers Frequent Visitors General Public

Effective Dose Limit 100mSv per 5 years 12mSv per year 1mSv per year

□ Site Exposure Dose limit

Category Workers Frequent Visitors General Public

Effective Dose Limit 16 mSv per year 10 mSv per year 1 mSv per year

Ⅱ. Brief Overview of Radiation protection [cont’d]

□ Radiation Work Control

Anticipated Exposure (man-mSv) Counter plan

< 10 Review and check work order

10 ~ 70 Work Order Approval

70 ~ 200 ALARA Acting Level Committee Review

> 200 ALARA Committee review

□ Collective Radiation Exposure

Ⅱ. Brief Overview of Radiation protection [cont’d]

Year

Ⅲ. Description of CCTV system

□ Purpose

Radiation Exposure Reduction

Efficient Radiation Safety Control in RCA

Continuous Check-up for important works and

facilities integrity

□ Characteristics Real-time information by LAN

Movable Cameras can support important or high

radiation work anywhere

Ⅲ. Description of CCTV system [cont’d]

□ Composition

Item # 5 # 6 RWB

Monitoring System 1 Set 1 Set -

Announcement System 1 Set 1 Set -

CameraFixed 7 Sets 7 Sets 4 Sets

Movable 2 Sets 2 Sets -

Data Cable 3.3 Km 3.3 Km 1.1 Km

Movable or Fixed

OfficeLobby Monitor

HP RoomConsole Lack

LAN LAN

Ⅲ. Description of CCTV system [cont’d]

□ Network

Building Elevation Location Details Main Function

ACB100 Locker Room Area Prevention of robbery

100 Entrance to RCA Check-up personnel coming in and out

SAB100 General Access Area “

77 General Access Area ″

FHB100 Truck Bay Area Check up entry and exit of equipment and person

142 Storage Area ″

PAB 144 Personal Airlock Area Controlling entry and exit in high radiation area

RWB

100 Hot Machine Shop Check-up personnel coming in and out

100 Entrance of RCA Controlling entry and exit in high radiation area

100 Truck Bay Area Check-up entry and exit of equipment and person

70 Access Area Check-up personnel coming in and out

Ⅲ. Description of CCTV system [cont’d]

□ Location (Fixed Camera)

Building ElevationNumber of

jacksMain Function

RCB

100 2 Installation and removal of SG Nozzle dam Installation and removal of SG man-way ECT (Eddy current test)

125 2 Maintenance of RCP and related works Lancing and FOSAR in secondary side of SG

142 2 Reactor Maintenance fuel loading and withdrawal Check-up entry and exit of equipment and person

Ⅲ. Description of CCTV system [cont’d]

□ Location (Movable Camera) Movable Cameras are communicated with main control center by using connecting jack

Ⅲ. Description of CCTV system [cont’d]

□ View of Fixed Camera

Ⅲ. Description of CCTV system [cont’d]

□ View of Movable Camera

Ⅲ. Description of CCTV system [cont’d]

□ CCTV system Diagram

PAB 144’

HP ROOM

ACB 100’LOCKER AREA ROOM

ACB 100’ Entrance of RCA

SAB 100’ GEN ACCESS AREA

SAB 77’ GEN ACCESS AREA

FHB 100’ TRUCK BAY AREA

FHB 142’ STORAGE AREA

PAB 144’ PERSONAL AIRLOCK AREA

LINK FACILITY

MATRIXSWITCHER

MONITORINGSERVER(DVR)

KEYBOARDKEYBOARD

MONITORMONITOR

to RWB

4SET

11SET

LINK FACILITY

Ⅲ. Description of CCTV system [cont’d]

□ HP Room Console Rack (Main control center) Real time Monitoring all places

where cameras are located.

Recording important works

Announcing

Auto Recording when any movement is detected.

Ⅲ. Description of CCTV system [cont’d]

□ Monitoring in HP Room Console Rack

All locations under surveillance The main work place

□ Comparison (use or not)

Ⅲ. Description of CCTV system [cont’d]

Work Year Number of workers

WorkingTime (man-hr)

Exposure Dose (man-mSv)

CCTV use or not

SG Nozzle Dam

2003 61 101 11.02 Not

2006 52 62 6.30 Use

ECT2003 435 1,044 38.3 Not

2006 290 698 23.41 Use

SG Man-way

2003 83 156 6.23 Not

2006 81 177 4.33 Use

Ⅳ. Cases for use of CCTV system

□ Removal of remaining Thermal Sleeve (T/S)

2005.05 Unit 5 third Planned Outage (37 days)

Case 1

During the first outage of unit 5, a metal object was discovered in

the Reactor Bottom Head. (conformed by Remote Video Inspection)

As a result of the specific inspection, three metal objects were

discovered. These objects have been identified as missing thermal

sleeves from the Safety Injection Nozzle.

A remaining T/S was planned to be removed during the third Outage

<Related event description>

Ⅳ. Cases for use of CCTV system

Material : Inconel 690Size (mm) : 304(W)×554(H)×4.5(T)Weight (kg) : 20KgDose rate (removal): 6mSv/hr

Ⅳ. Cases for use of CCTV system [cont’d]

□ Monitoring T/S Work through CCTV System

Ⅳ. Cases for use of CCTV system [cont’d]

□ Result of ALARA ControlTarget (mSv) Result (mSv) %

Dose 160 73.91 53.8

Reason of exposure Reduction

Content Reduction Rate(%)

Work control (Lead shielding and vest) 10

Reduction of the Number of person( Effect of CCTV) 10

Optimization of Working time (Effect of CCTV) 6

Cancellation of some work 28.8

SUM 53.8

Ⅳ. Cases for use of CCTV system [cont’d]

□ Effect of using CCTV System

Reduction of Exposure : 16 man-mSv (10%) About 15 persons supervised the work through CCTV

during the working period (11days)

= persons x staying time x Radiation level in the area

Optimization of Working Time : 9.6 man-mSv (6%)

Reduction of Radioactive Waste : 1 Drum

About 220 pairs of Rubber gloves / paper protection Clothes

Ⅳ. Cases for use of CCTV system [cont’d]

□ Maintenance of leak Valve (SI-V522) in SI System Date : ’07. 7.17(unit 6 fourth outage) Work Description

• At the time of NOT/NOP, SI- check Valve 522 of High Presser

Safety injection Header leaked

• Piping was isolated throughout Ice plugging and Valve was

Maintained

• CCTV System was used to monitor the maintenance work

and ALARA Control

Case 2

Ⅳ. Cases for use of CCTV system [cont’d]

□ Result of ALARA Control

Target (mSv) Result (mSv) %

Dose 6.69 5.75 14

Number of workers : 16 Total working time : 6 hrs

Ⅴ. Effects

Reduction of the number of person coming in and out

Reduction of exposure dosage

Reduction of radioactive waste

Savings in protection supplies

Real-time checkup in the office

Radiation safety control in high radiation areas

Ⅵ. OSART GOOD PRACTICE

□ IAEA OSART Review Duration : 2007. 4.16 ~ 5.3

Reviewed items

- 7 items besides management, organization, &

administration sections of YGN 5&6

Result of review in Radiation Protection Section

- 2 good practices out of 10 good practices

(No proposal for improvement) - CCTV System was evaluated as “Good Practice” the other is RIS (Radiation Information System)

Ⅵ. Conclusion

Radiation safety control is requisites for lasting nuclear industry

Our various efforts will help to improve radiation safety control whether it is large or not Actually, CCTV system is small effort but the such effort will makes a good fruit

Our will and endeavor should be followedOur will and endeavor should be followed

Maintenance of Leak Valve (SI-V522)

Maintenance of leak Valve (SI-V522)

□ KHNP(Korea Hydro & Nuclear Power) OrganizationHeadquarters

Branches

President & CEO

Nuclear Power SiteNuclear Power Site

Nuclear PowerEducation Inst.

Kori

Nuclear PowerEnviron. Tech. Inst.

Radiation HealthResearch Inst.

Hydro Power

QA Office

Plan & Admin Div.Plan & Admin Div. Project Div.Project Div.

PI Office

Han-gang Hydro Power

Radwaste Project Div.Radwaste Project Div.

Radwaste ProjectSite OfficeNew York Office

Paris Office

Yonggwang Wolsong Ulchin

Power Gen. Div.Power Gen. Div.

Gen. Admin. Office

Plant 1 (Unit1&2)

Plant 2 (Unit3&4)

Plant 3 (Unit5&6)

Comm. & Envir. Off.

KHNP Overview

Auditor Audit Office

Ulchin #1,2,3,4,5,6 (Shin-Ulchin #1,2)

◎ Seoul

Kori #1,2,3,4(Shin-Kori #1,2,3,4)

Wolsong #1,2,3,4 (Shin-Wolsong #1,2)

In OperationUnder

Const/PlanedTotal

4 (3,137)2 (2,000),

2 (2,800)/ - 8 (7,937)

4 (2,779)2 (2,000)/

-6 (4,779)

6 (5,900) - 6 (5,900)

6 (5,900) - /2(2,800)

8 (8,700)

20 (17,716) 8 (9,600) 24 (21,716)

Unit (MW)Site

Kori

Wolsong

Yonggwang

Ulchin

Total

□ Status of Nuclear Power Plants

Yonggwang#1,2,3,4,5,6

KHNP Overview [cont’d]

20 units (17,716 MW)

Project Unit ReactorType

Capacity(Mwe)

NSSSSupplier A/E COD

Yonggwang

#1#2#3#4#5#6

PWRPWRPWRPWRPWRPWR

9509501,0001,0001,0001,000

W/HW/HDOOSANDOOSANDOOSANDOOSAN

Bechtel/KOPECBechtel/KOPECKOPECKOPECKOPECKOPEC

Aug. 1986Jun. 1987Mar. 1995Jan. 1996May 2002Dec. 2002

Kori

#1#2#3#4

PWRPWRPWRPWR

587650950950

W/HW/HW/HW/H

GilbertGilbertBechtel/KOPECBechtel/KOPEC

Apr. 1978July 1983Sep. 1985Apr. 1986

Wolsong

#1#2#3#4

PHWRPHWRPHWRPHWR

679700700700

AECLAECLAECLAECL

AECLAECL/KOPECAECL/KOPECAECL/KOPEC

Apr. 1983Jun. 1997Jun. 1998Sep. 1999

Ulchin

#1#2#3#4 #5#6

PWRPWRPWRPWRPWRPWR

9509501,0001,0001,0001,000

FramatomeFramatome DOOSANDOOSANDOOSANDOOSAN

FramatomeFramatome KOPECKOPECKOPECKOPEC

Sep.1988Sep. 1989Aug. 1998Dec. 1999July 2004Apr. 2005

□ Nuclear Power Plants in Operation

KHNP Overview [cont’d]

Project Unit ReactorType

Capacity(Mwe)

PlantType COD Remark

Shin-Kori

#1 PWR 1,000 *OPR1000 Dec. 2010

Under Construction

#2 PWR 1,000 OPR1000 Dec. 2011

#3 PWR 1,400 *APR1400 Sep. 2013

#4 PWR 1,400 APR1400 Sep. 2014

Shin-Wolsong

#1 PWR 1,000 OPR1000 Oct. 2011Under

Construction#2 PWR 1,000 OPR1000 Oct. 2012

Shin-Ulchin

#1 PWR 1,400 APR1400 Dec. 2014Planned

#2 PWR 1,400 APR1400 Dec. 2015

8 units (9,600 MW)

* OPR : Optimized power Reactor* APR : Advanced power Reactor

□ NPP planned or under Construction

KHNP Overview [cont’d]