ML18151A040

LER 87-018-00:on 870729,control/relay Room Chiller a Freon Relief Valve Lifted.Chillers B & C Tripped on Listed Dates. Caused by Low Svc Water (SW) Flow Due to Buildup of Seaweed in Upstream SW Strainers.Strainers cleared.W/870828 Ltr

ML18151A040
Person / Time
Site:	Surry
Issue date:	08/28/1987
From:	Benson D VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
87-020, 87-20, LER-87-018, LER-87-18, NUDOCS 8709100177
Download: ML18151A040 (4)

Text

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.' NRC Form )&8 19 8JI FACILITY "AME 111 OOCKET NUMIER 121

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Surr Power Station Unit' '1 . \: *: o s o o o TIT\E"' Control /Relay Room Chillers Inoperable Due To Inadequate Service Water Flow t-_ _E_v.....E_"r__ 7:..1.:.,_.__ _ _"":'7":"."."~0T"'.".H-:'.E:":"A'.".'f:-:A:=-Cl_L*_r_,E_s-'"_v_or.LV:;;E:;;:0::;-11;;1~~7;;'iT,""--7""71 oA_T--rE-15_,- - + - - - . - - - , LE":".R:-::"c:'.l":".IM:".':B;7ER:_1~81:.....~~d---R:;,.:E~P=OA~T~D:.:.A:.:,T:.E:.:.'

s*e~~~:~AL *. ~~ti!/,~ MOl'llH OAY YEAR. FACILITY "AMEii OOC"ET NUMBERISI 0 5 0 0 0 0 7 2 9 8 7 8 7 0 1 8 0 0 0 0 5 0 0 0 T><l5 REPORT IS iUIMITTED PURSUANT TO TM£ RECUIAEMENTI Of 10 CHI §: /Ch,ct on, or mo,, al 1h1 lollo*nnvJ 1111 OPER*Tl"O t---"'-o_o_E,-1a_1 --'--'-N"'+-_ 20.<021*1 20.'60elcl &o.7311112111*1 73.71 lbl POWER .~ ..&061*11111,I IO.Jlltll11 &o 73111121M 73.71 lcl LlVEL 1101 0 0 &o.Jllcll21 &o.731111211,111 OTHE A 1Stucdr ,,, Ab1tr1tt 0,10.,, ,,.d ;,, r,.,. NRC Form~

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&0.73111!21(111 00.731111211.1 .. 1111 20.40!I la 11111*1 60.7311112111111 !lo" .'3111121111 LICENSEE CO'ITACT FOR THIS LEA 1121 TELEPHONE NUMBER AREA CODE D. L. Benson, Station Manager 8 0 4 3 5 7 - 3 1 {3" COMPLETE ONE LINE FOR EACH C:OMPONENT FAILURE DUCAIIIED IN THIS REPORT 1131

.,:.\uSE S"'s1e.vJ  ::o*.1PO'*E"-~ '- 1 ~',U~a\C REPORTABLE MANUFAC EPORTABLE T _;q( s=1 TO NPROS 9AUSE SYSTEM COMPONENT TUP.ER I TO NPRDS MONT><

E>PECT[O

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DATE 11~1 on July 29, 1987 at 2155 *.hours; *the *freon relief valve lifted on the 'A.' control/relay:,:1:oom .chi.ller .{EIIS-CHU}, and the chi.ller was declared. inoperable~: :*The** . ' C.'. chiller had previously been decl~red~inoper~b1~ f6r the same reason, leaving only 'B' chiller operating. This is contrary to Technical Specification 3.14 which requires one control/relay raom chiller to be operating and another to be operable. The 1

'C chiller was returned to service at 2236 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.50798e-4 months <br />, but it tripped again at 0015 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> on July 30. By 0140 hours0.00162 days <br />0.0389 hours <br />2.314815e-4 weeks <br />5.327e-5 months <br /> the 'A' 1

and 'C chillers were returned to service. On August 5, 1987 at 0245 hours0.00284 days <br />0.0681 hours <br />4.050926e-4 weeks <br />9.32225e-5 months <br />, the 'C 1 Control/Relay Room Chiller tripped on high discharge pressure and was declared inoperable. The 'B' chiller had previously been declared inoperable for the same reason, leaving only the 'A' chiller operating. The 'B' and

'C' chillers were returned to service on August 5 at 0319 hours0.00369 days <br />0.0886 hours <br />5.274471e-4 weeks <br />1.213795e-4 months <br />. At the time of these events, Units 1 and 2 were at 100%

power. Th0 chillers tripped and/or had freon relief valves Jift due to high condenser discharge pressure resulting from low service water (SW) flow. The low SW flow was due to a buildup of seaweed in the upstr~am SW strainers {EIIS-STR}.

The sw strainers were cleared of debris.

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NRC Fo,m >HA 19 8ll LICENSEE EVENT,.R,E'iO~r::,:JE*~i:~~~T *;:O*N:i;NUATION'

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1. o Description o'f>the'.'Event*~' *

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On July 29, 1987 at. :2155 hours,. the freon relief valve '  ;\ *, ~I lifted on one of the thr~e control/relay room chillers (l-VS-E-4A) {~IIS~CHU}, and the chiller was declared inoperable. The 'C' chiller unit (1-VS-E-4C) had previously been declared inoperable for the same reason, leaving only one chiller (1-VS-E-4B) operating. This is contrary to Technical Specification 3.14 which requires one control/relay room chiller to be operating and another to be operable. The 'C' chiller was returned to service at 2236 hours, but it tripped approximately 2 hours later at. 0015 hours on July 30, 1987. By 0140 hours on July 30, 1987, both the 'A' and

                                                          'C' chillers were returned to service.

On August 5; 1987 ~t 02~~!h6ur~; the 'C' Control/Relay Room Chiller tripped on high,discharge pressure and was declared inoperable. The >'B' .chiller unit (1-VS-E-4B) had previously been decl~~ed inoperable for the same reas~n, leaving pnly one chiller (1-VS-E-4A) operating. The 'B' and 'C' chiller~ were returned to service on August 5, 1987 at 0319 hours. At the time of these events, both Uriits 1 and 2*wer~ at 100% power. 2.0 Safety Consequehces*and Impl{c~tions The control/relai too~ ~ii~c~n~itioning system c6nsists of three*.100% capacity.air conditioning chiller units. *The design temp~rature:of the control and relay room spaces is from 40 degrees Fahrenheit to 100 degrees Fahrenheit and the electrical equipment has been qualified at 120 degrees Fahrenheit ambient temperature. During this event, the control/rel~y room air handling units remained operable or operating and one chiller unit remained operable. Additionally, there was no noticeable increase in ambient tem~erature cf the control or relay room areas. Therefore, this event did not create an unreviewed safety question and the health and safety of the public were not affected.

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NRC Form 366A 19-8JI LICENSEE EVENT RE~ORT (i.ER) TEXT-,:CONTINUATION 4PPP.OVED Q',18 *;o Jl!,0-0104

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NU'-' E Ill *'.*'*,.* ~ M EA Surry Power Station, Unit 1 *

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The Control/R~l'~~:i;k6~*~:_ch.iile:rs. ~~ipped* and/or had freon relief. valves lift-'due t:o high condenser discharge pressure re~~tting irom low service water (SW) flow. The low SW flow was due to a buildup of s0.aweed in the upstream SW Y type strainers {EIIS-STR}. A contributing factor is-that a rotating strainer in the SW system is currently being replaced. 4.C Immediate corrective Action The SW strainers were cleared of debris. 5.0 Additional Correcitive Action Service water pressure.to.the Control/Relay room_ chillers is checked every four hours; and the SW strainers are cle~n~d whenever SW pressure becomes low. 6.0 Action Taken to Prevent Recurrence The control/relay room: ventilation system is being evaluated by Engineering; and plans are being developed to upgrade the system. The rotating strainer will be replaced. 7.0 Similar Events See Ul-LER 87-005~ 8.0 Manufacturer/Model Number N/A .... I-IC I Q'4V J61'1A o tJ S GPO <988*0*624*5381455

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I. e Vepco VIRGINIA ELECTRIC ANO POWlR COMPANY Surry Power St,tion P. 0. 8011 316 Surry, Virginia 23883 August 28, 1987 U. S. Nuclear Regulatory Commission Serial No: 87-020 Document Control Desk Docket No: 50-280 016 Phillips Building LicensP. No: DPR-32 Washington, D.C. 20555

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Gentlemen: Pursuant to Surry Power Station Tech~ical Specific~tions, Virginia Electric and Power Company hereby submits the following Licensee Event Report for Surry Unit 1. REPORT NUMBER 87-018-00 This report has been reviewed by the Station NuclLar Safety and Operating Com~ittee and will be reviewed by Safety Evaluation and Control. Very truly yours,

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                     . *'.'._ *.1L-~ *,, *1*1 A David L. Benson Station Manager Enclosure pc:          Dr. J. Nelson Grace Regional Administrator Suite :?900 101 Marietta Street, NW Atlanta, Georgia                                   30323}}