ML20128L568

Rev 5 to Inservice Testing Plan, for Unit 3

ML20128L568
Person / Time
Site:	San Onofre
Issue date:	07/31/1985
From:	SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML13309B564	List: ML20128L568
References
PROC-850731-01, NUDOCS 8507250061
Download: ML20128L568 (5)

Text

W" 4

INSERVICE TESTING PLAN REVISION 5 SAN ON0FRE NUCLEAR GENERATING STATION UNIT 3 SOUTHERN CALIFORNIA EDISON COMPANY l

JULY 1985 f

i 8507250061 850723 PDR

~~

, P ADOCK 05000361 PDR

INSERVICE TESTING PROGRAM SAN ONOFRE - UNIT 3 REVISION NO. 5 SYSTEM: Main Steam COMPONENT: HV-8204 HV-8205 CATEGORY: B CLASS: 2 FUNCTION: Main Steam Isolation Valves.

These valves close on MSIV and CIAS to significantly reduce steam flow from the steam generators.

TEST REQUIREMENT: Part stroke exercise the valves every 3 months.

BASIS FOR REVISION: The part stroke exercise is not practical.

There is no increase in failure rate in any safety system component in an unconservative direction. The degradation resulting from the part stroke testing during operation makes it difficult to maintain the valve open for power operation.

The damage and required repairs are an undue burden.

Even had an MSIV failure in an unconservative direction occurred, a single failure has been evaluated and found to be acceptable.

The ASME B&PV Code,Section XI, Paragraph IWV-3412(a) states that the part stroke exercise need not be performed during power operation.

ALTERNATE TESTING: The valve will be full stroke exercised during cold shutdown conditions on a frequency required by ASME, B&PV Code,Section XI, Paragraph IWV-3412(a).

3 4 .

PROGRAM DOCUMENT CHANGE (1) System Valve List, p. 18 of 27: for MSIV's HV-8204 and HV-8205 delete "BTP" from Test column and "0P" from Test Mode Column.

(2) Cold Shutdown Valve Testing Justification Table, p. 9 of 10: For HV-8204 revise justification to the following:

Main steam isolation valve. closing this valve during power operation would result in plant shutdown.

Exercising this valve during power operation has been determined to degrade the actuator hydraulic system, causing the valve to fail closed which results in a plant shutdown. This valve will be full stroke exercised during cold shutdown.

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VALVE Stoke val.VI VALVI VAlVL ACIR. Nol(mat SIltokE IIST TIME RIl if f

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Pli l(R llV-7259 it-6 2 A 3" CA A0 0 C Al RR 40 Notes 3 IST UP & to 08 OP a 13 Pli RR

__PtUCl l AIL}LHVICI WA l l.It P k ID # ljuQll yS0J llV-7911 [-$ 2 A 3" CA A0 0 C Al RR 40 Notes 3, BI OP 10 & 11 IST OP & 13 Pli RR 3,236-C-615 [-4 2 AC 3" Ch SA C C Al RR Notes 3, 9, 10 &

n & 13 MAIN SifAM P AjD__g _ful41SO]

l IIV-4053 C-6 2 8 6" CL A0 0 C Pli RR 20 Note 3 IST OP & 13 BI OP i IIV-fau$fs I-6 2 B

% ,CL A0 0 C Pli IST RR OP 20 go 3 BT OP llV-4051 15 - 6 2 B 3/4" CL A0 0 C TST OP 20 Noto 3 BI . OP & 13 plt RR

ilV-40$8 [-6 2 B 3/4" CL A0 0 C iST OP 20 pote 3 DT OP a 13 Pli RR llV-8704 [-2 2 8 40" CA IlY 0 C IST CS 5

• Note 3 ni CS & 13 l P1i RR llV-8?OS l-4 2 8 40" CA HY 0 C ISI CS $

• Note 3 al CS & 13 l Pli RR

. e SAN ONOIRE 800 CLEAR CLN[RAll80G STAT ION

• UNIi 3 Pact 9 Of.30-

• COLD SitUllMMN VALVL ILSIING JUSI il ICAI 8001 IABLL VAf9L V !VE JUSill ICAllOft I OR COLD S8H11 dowel M.U. Mut R 'C00HD. CLASS C4I. IES_I191G f REQUEIICY Of VALVES MAIN STEAM PalD A40141 Main steam isolation valve. Closing this valve during power operation would HV8204 E-2 2 e result in plant shutdown. Exercising this valve during power operation has been determined to degrade the actuator hydraulic system, causing the valve to fail closed which results in a plant shutdown. This valve will be full stroke exercised during cold shutdown.

IIV8205 l -8s 2 B Same as XV8204 IIV8419 Il-6 2 8 Atmospheric dump va lvo. Exercising titis valve during power operation could result-in a low steam generator pressure indication which would shut the main steam isolation valve and result in a plant shutdown. This valve will be full stroko exorcised during cold shutdown.

liv 88a21 I-5 2 B Same as llV8819 i 6-12ts-C-599 D-T 2 C 1xercising this valve during power operation would result in placing unnecessary thermal stresses on time feedwater piping which could result in p rer.a tu re f a i lu re o f th i s pip ing. This valve will be full stroke exercised during cold shutdown.

6-448-C-999 i-T 2 C Same as 6-124-C-$99

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