ML20236G128

Trip Rept of 821129 & 30 Visits to Wyle Lab Re Review of Set Pressure Testing of Target Rock Safety/Relief Valves.List of Attendees,Agenda & Viewgraphs Encl

ML20236G128
Person / Time
Site:	Hatch
Issue date:	12/09/1982
From:	Hammer C Office of Nuclear Reactor Regulation
To:	Cherny F Office of Nuclear Reactor Regulation
References
TAC-48771, NUDOCS 8711020431
Download: ML20236G128 (11)

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q LDocket No.: u50-321 MEMORANDUM FOR:- F. C.:Cherny, Section. Leader-u Mechanical Engineering Branch, DE

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C. G. Hammer Mechanical Engineering Branch, DE h

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SUBJECT:

TRIP REPORT-N0VEMBER 29 & 30, 1982 TO WYLE 4 LAB.T0 REVIEW SET PRESSURE: TESTING-q 0F: HATCH'1 TARGET ROCK 1 SAFETY / RELIEF y

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' VALVES - TAC #48771.

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On November 29 & 30, 1982, Kulin Desai of' the Reactor Systems, Branch;.

O George Rivenbark of Licensing-(Hatch PM)~ and Gary Hammer ofLthet.

1 Mechanical Engineering Branch visited Wyle Laboratories in Huntsv.ille -

Alabama to discuss with Georgia Power Company,. General.. Electric'and Wyle d

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representatives the progress which-is being made toward solving the.

j setpoint drift problems which have been experienced on:TargetfRock.

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L 2-stage safety relief valves-(SRV!s).

Of particular interest has been

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the event at the Hatch Unit 1 nuclear. plant where all eleven SRV's1 a y]

L failedtoopenwithintechnical.specificationsetpointtolerance7(*1%).

when. challenged to relieve excessive reactor 1 pressure on Julyi3, 1982.

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GE is' undertaking,-on behalf of Georgia Power, a special test' program at'.

, :gj Wyle of all the Hatch valves:to try to: determine the reason for the<high aj setpoint drift. As of November 29, 1982, the first seven of<the valves) 1 had successfully passed the first screening te'stffor; opening'on less-j than or equal to 103% of setpoint steam pressure applied at a : fast.

W ramp rate of 60-120 psi /sec. The next valve,.which was being. tested; when the NRC personnel arrived at-Hyle' November 29, did not pass this e-1 screening. test.

It was then tested with air pressure with the. valve. air-actuator lifted to remove spring load from the pilot-to determine the.

, force required to unstick the pilot disc from'its seat. The disc'did C

not unstick using a maximum air pressure of 50. psig. At'the time.of' this test, we could not determine whether this valve had been cycled after the Hatch event. We didLlearn from Georgia' Power that althoughi E 1

.they intended to leave'a few valves in~the uncycled conditionLthe plant:

experienced another transient that resulted'in a. reactor. scram sometime i

during August and that many if not all the SRV's were again challenged.

During this transient all valves functioned properly.

Mr'. ' Paul Springer of Georgia Power agreed to provide us with information.as ~to which.

w; valves were opened and when,'for the operating period since-the July transient.. In subsequent discussions with Mr.. William Burns.of Georgia '

E Power on' December 3,1982, we learned that this valveiwasflast cycled; y J

about September l' or 2,1982..

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n A second valve was then steam tested'during'.our' visitIanksuccessfu11yL -

. opened ffor both 'a slow. ramp pressure' rise (0.5 psi /sec.)^and:a ~ fast ramp.

(60-120; psi /sec) at between 1084,to31086ipsig!(1080 psig:;setpoint);;

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' Mr. John Boseman. of GE who 31simanaging;this, specia1Ltest progrpm atLWyle t ;i t

-decided that both these" valves'would beivisuallyLinspected nespecially?

q inlthe pilot' disc / seat area:toinote'any/ scale' build-up"or noticeable

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corrosion'which'mightl explain' the sticking phenomenonFTheLvalve whiche i3 l

exhibited sticking would be observed with thelpilot discistill:stuckiin,

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decided that there'should be'a metal.lurgical/chemic51L analysis 1 performed"

/j its seat and ' compared with the: valve!whichioperatediproperly. ' He 'also l on 'the pilot ~ discs 1to determine the ~ compc41 tion ofJany.corrosionLori d

o sediment j

with:Mr., build-up and its1 characteristics uln subsequent discussions ~-

W '.h Burns on[ December 3,t 1982,(we:1 earned that signifi of' corrosion or se'dimentiwas observed {in?thefdisc/ seat'areacant? bridging m

L sticking valve when it was?indeedidisassembled,:0 '

fof?theT i'~

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y At present, Georgia Power Iis~ un' ertakingLthis iiest-program withoutlany".

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.BWR 0wners Group participation..The 0wners Group is;scheduledsto have aJ i

meeting on December 7 &.8, 1982 at which time they will vote'on whether' J

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to participate.in: continuing-the testing and evaluatio'n"of thesel valves.

4j 7

q During ;our visit to Wyle on the afternoon'off November 30~, 1982,(GE, Target Rock, and Georgia PowerLmade a presentation onitheir: planned.

q overall evaluation procedu_reito. determine:theLcause.of;the'highisetpoint i

drift problem. Attached is the-handout GE used..in their presentation.

n 0 along with a list of.those present.

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LC' GL-Hamme~r.

MechanicalEngineeringLBranchi

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Attachment:

As stated l

cc:

R. Vollmer, DE

' G. Lainas, DL

.e J. Knight, DE G. Rivenbark, DLh

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R. Bosnak, DE J. Stolz, DL 1

F..'Cherny, DE H. Gregg, RES K. Desai, DSI G. Holanan, DL

'u W..Hodges, DSI S. Rubin, AE00.

l B. Sheron, DSI Ms Wegner,.IE T. Speis, DSI A.-Cappucci,'ACRS.

4u h-R. Mattson, DSI J. 01shirski,~RII-4 R...Baer, IE E. Brown, AE0D' 0

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