ML20066K226
| ML20066K226 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/28/1991 |
| From: | Beck J, William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-91047, NUDOCS 9102050224 | |
| Download: ML20066K226 (7) | |
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Log # TXX-91047 C-File # 10010
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Z 905.4 7UELECTRIC Ref.
Mitham J. Cahill, Jr.
Iwunn ekt Mrsutem U. S. Nuclear Regulatory Commission Attn: Docut'ent Control Desk Washington, D.C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NO. 50 445 REllEF RE0 VEST FROM ASME SECTION XI COLD SHUTOOWN FULL STROKE TESTING OF THE RES10 VAL HEAT REMOVAL (RHR) PVHP DISCHARGE CHECK VALVES REF: TU Electric letter (TXX 91046) from William J. Cahill, Jr. to the NRC dated January 26, 1991 Gentlemen:
Valves 1 8730A and 1 87300 are the RHR pump discharge check valves.
Per the present inservice Testing Program Plan for CPSES Unit 1, these valves are to be full stroke tested at cold shutdown.
The referenced letter r';. quested an NRR Waiver of Compliance from SURVE!LLANCE REQUIREMENT 4.0.5(a) for this testing until relief from ASME Section XI could be requested, reviewed and granted.
The NRC orally granted the NRR Waiver of Compliance on January 26, 1991.
This letter hereby requests relief from ASME Section XI rald shutdown full stroke testing of RHR pump discharge check valves 1 8730A and 1 0730B in accordance with 10CFR50.55a(g)(5)(iii).
g is the relief request as it will appear in the next revision of the CPSES Unit 1 inservice Test Program Plan. is a markup of those additional pages in the CPSES Unit 1 Inservice Test Program Plan which will be revised to be consistent with this relief request.
The relief request states that these check valves cannot be full stroke exercised during cold shutdown because insufficient volume exists in the Reactor Coolant System (RCS) for injection.
While this statement is true, the capability of the RHR to Reactor Water Storage Tanks (RWST) return line to safely pass the flow necessary to periodically demonstrate satisfactory valve performance during cold shutdown has not been fully assessed.
This assessment is currently being done.
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TXX 91047 Page 2 of 2 If, subsequent to the granting of this requested relief, 10 Electric ascertains that full stroke testing can be repetitively performed during cold shutdown via the RHR to RWST return line, TU Electric will modify or withdraw, as appropriate, this relief request and the relief request for the RHR pump suction check valves, 1 8958A and 1 8958B.
The relief request for the RHR pump suction check valves has the same basis as the relief request for RHR pump discharge check valves and are in the sanie flow path.
The NLC granted an interim period of relief for the RHR pump suction check valves in supplement 23 of the safety evaluation report for CPSES (NUREG 0797, Supplement No. 23 dated February 1990).
Should these relief requests be withdrawn, TV Electric will consider CPSES Unit 1 in compliance with its technical specification surveillance requirements until the next cold shutdown of sufficient duration as described in ASME Section XI that is available to test these check valves.
Written approval of this relief request is requested by February 9,1991, to be consistent with the duration of the NRR Waiver of Compliance as requested by the referenced letter and orally granted on January 26, 1991.
Sincerely, William J. Cahill, Jr.
By:
M d.
Joh
. Beck Vic> President, Nuclear Engineering HAM /gj Attachments c
Mr. R. D. Martin, Region IV Resident inspectors, CPSES (3)
Mr. J. W. Clifford, NRR
4 TXX 91047 Page 1 of 1 CPSES INSERVICE TESTING PROGRAM PLAN REVISION 4 PAGE 37.1 l
REllEF RE0 VEST NUMBER:
14.2 SYSTEM: RESIDVAL HEAT REMOVAL (RHR)
VALVE NUMBER (S):
1 8730A, 1 87300 CATEGORY:
C CLASS:
2 FUNCTION:
Open to provide flow to the Reactor Coolant System from the'RHR pumps.
TEST RE0VIREMENT:
Exercise valve to position required to fulfill their function at least once every 3 months in accordance with IWV 3520.
BASIS FOR RELIEF:
POWER OPERATION - These check valves cannot be full stroke exercised during power operation because the full flow l
path discharges into the Reactor Coolant System.
l COLD SHUTDOWN These check valves cannot be full stroke exercised during cold shutdown because insufficient volume
%xists in the RCS for injection.
ALTERNATE TESTING:
Perform a partial stroke quarterly.
Full stroke exercise these check valves at each refueling outage.
I APPENDIX A E--
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'i ATTACHMINT 2 Txx-91047 enac 3 or 4 ICR No:
ISTwR3 002
- nts-:xstRvier testzw, rRm na R:vuren:
FA0f 5 NRY's.1 P&&!!A and 1 K'V 653. Sie riot required to shut dr,wn the reacter to the cold shwtdewn conatt son Trev
.re. hewev.r.,ewired to to avaitable decir.3 power oser.ston to prevm chauer.ses to the stesesrise, safety vatves. They may t. required aarte.g snotdown e,e,etion to stovide overg e m,e p,ctection
- n eree, t, ur r.,e t>e w eswence of p Rv sticatng o,.n.
inese valves w ut to feu strcaed usercised dering.ctd sn tsa-s
- >tn.tSSED AIR s1 'lM 7,g t e t e ry A Velves Valve 1 KV 36s?, ins.? d att to contairment cannot be twil or partsat sttrae esercised during power
- rersta;r, Closing this valves to ass fltah strots time testing isolates instrument att to the contaareent and this att,s requited for plant control. Testing could resu., in a plant trap and/or operettonal transient This vaive w;i. te f un stres. serctaed etwr > n sole shutdowns when instrument att to the contaireent can be secured witteet r avit s ar.
upan ' stant operettom.
VIN ulID WAttA,sdtEN C a t ep ry A Veh va.res 1 NY.agg2. 1 IN-4043 and 1 tfV gCg6 ventaletton ch111ed sater to and free contein w 4ioistaen vaives.
cannot be full or tatt. ') etroke esorrnsed during power operation. Closing these valves to og empit sn s t r:s e t a+,
testirg tseletes a 4 vond *. ton challed water systee heat loads to the contatraent. In addit;V-valve ist;wre dwttre te st4tg coule readt afr " rceeding contatrument temperatute Technical Specification Itants po s tr iy ress't in damage 6 envirttt%t illy t.s tied viestrical equirment. These valves w&LL be full-sthae end'
- , a Jurare cold shutMwns whea terMastion t 'lled water cooling to the containment can be saf ety,ecuted RIs! DUAL sIAt VJOVAL SYSTEM 01t et it? A Velveg Valves 1-8701 A and 8 and 1-g702 A and B RCE hot les to RER teclation valves, cannot be f un or partia; strae exegensed during power operation since these vabe.e are interlocked with RC5 pressure which prevents trentra sese t alves when RCK prese =re is greater than 423 pets. These valves will be full streme esercised d$rtra ceid shutdowne.
C A gef J Valveg Valves 18716A awd 1 g1138, IUR o 'esstle valvec in occordance wath !! Inferr.ation Motice No. 3 7 01. a t ). r-to emett 6 sed daring power opetation. tMbre of either velve an the closed position. concurrent wnth tre f a...te :(
to on4y two of the required four reactor coolant system c:'c ess an lutt pump results in ECCS traectse D3 5
These valves wall be full stroke esers eM LWang cold shutdgwns when they can be exercased witneut cra.;ers.ra M E005 captuttes.
Ortveern._C Valveg e
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T7m-ar4 1 87308 AutR purap (Tirheesehek valves. ca.
stroke eieretsed darte neretten. There Ts7 0T r Twa w rath xisteer Wo7.G.iercio..i.3ouavir as pow.r-or, reter ia; fun flow a w w n n e.ctor
=t3,5 4 3e,an. peg, bat w ton ru rs.
o opentse watnal operettna preaut, thaeR anKef13P&M. througn't normally isoistTM+64 e
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ATTACIiMENT : 2 :
TXX-91047 Tmqc'4*of 4 e
,j ICR No:
I ST-R3-002 CPSES*lNSERVICE TESTING FROGRAM Ft.AN REVISION 3 Pact 6 egyrfiiEE a
. ~ ka uttitaed with the plant at power. The valve alignment and resultar:t RER conf t u
m,u,
d u.ded s.f ety conditien, ren2rirrns-twe4sitaritem anoperabte.p
. e ts.tignment C 3 co.r.d. tion -.neta _ discusses how o e nas et,usrev.te.amover.1.2,s6. *ervransneuse ssss has resulted in sygen,.Aonl4vr naoJtTrt "'aQ_sesat @
e valves wati ce p,..;_ 'me asettra ly and full-stroke esercised a6 ent"l G down N SATETY INJECTION SYTTEM Ceteaory A "alves Valves 1-8809 A and B, RaK injection to RCS cold less isolation valves, cannot be full or partial strate exercises during power operetton since this would cause a loss of the required number of cold leg, Lew head safety an;sction flow paths. - In addition 'echnical Spectittetton Survettlance Requirement a.S.2.a requires these velves te on the Open position with power to the valve operators removed in Modes 1, 2, and 3.
These valves will be (all str:se eserctaed during cold shetdowns.
Valve 1* 6835, SI pep discharge to RCS cold les Argection isolation valve, cannot be tutt or parttat strose e.ercised duttng power operation since f ailure in the closed position would isolate the $1 purnp to att ROS nid y
less injection flow patha. In addition Technical Spectf acation Survet11ance Requirement a S.2.e re:tutres this
' valve be tn the Open posation with power to the valve operator removed tn Modes 1, 2, and 3.
This valve wn!. te full
- stroke esercised during cold shutdowns.
f Valves 1*t001A,1*48028, and 14840, normally closed motor operated gate valves an hot 1st snjection itnes, cannot be full or parttal stroke' exerctaed during power operetton since Technical Specitteetton a.S.2 a regatres these valves to be maintained in the closed positten with power removed from the operators to operat.on Modes 1
- 2. and
' 3, These velves will be full stroke exercised dustas cold shutdowns.
Valves 1 6811A and 1*08113. RER contatrement rectrculation sump Asolation valves. cannot be full or parttai ste:4e exercised with the plant At power, The stroke test of these valves requtres isolating the RHR pumps from tre h !!
to prevent stavity dectntos the RS4T to the containment sump. The absence of a check valve to the RMR suctten ;ine potentially-could push avetor into the contalement sump which would then require removal. The RHR pump suctton header would then have to be partially drained to prevent water back flow to the sump rendering the pumps knoperable. An additional concern involve 6 the ability to adequately vent and (L11 the system af ter testang The additional risks encountered and enount of time to perform testing do not justify the addittonal assurance sained by quarterly testing. -these valves will be full otroke esercised*during cold shutdown when the proper preca.t ans can be taken without igesting operation.
Catemory B Valves Velves 1*g404A and B, t.*hstatus Puey Suction from RHR$ EX, cannot be full or partial stroke exeressed dortna pwer operation due to interlocks, 1*4304A, sad 1*04048 are opened by operator action during the restrculotton tode of
. !!S operation following e ICCA to supply the auctions of the Charging and Safety Injection Pumps, the va;ves are interlocked with ECCS v&lves 1*0413,18414A and 18s148., These valves must be closed to open 1-66C* A and aml Valve 1 8813, as noted below, to required to be open with the plant at power to protect the $1 pumps by prm.cas a minimum flow protection path. These valves will be full stroked during sold shutdowns.
Valve 16006, SI pump suttton face the RWST isoletton valve, cannot be full or parttel stroke exegessoa sa:es
- n power operation since f ailure of this valve in the closed position would rende.t 'woth trains of SI sneperac..
addition, valve 1 8804 is requised to be in the open posttion, with power to the valve operator removes a s.no f
Modes 1, 2, ed 3 per Techntcal Specification a.S.2.a.
These valves wtL1 be full stroke exercased da.rs
.J shutdowns, 1
l APPENDIX B
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