ML19343B433

RO 50-219/80-13:on 801204,plant Intake Water Level Reached Critically Low Elevation,Affecting Supply of Cooling Water to Main Condenser,Reactor & Turbine Bldgs.Caused by Environ & Svc Conditions.Dilution Pumps 1-2 & 1-3 Restarted

ML19343B433
Person / Time
Site:	Oyster Creek
Issue date:	12/17/1980
From:	Finfrock I JERSEY CENTRAL POWER & LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
RO-50-219-80-13, NUDOCS 8012230468
Download: ML19343B433 (4)

Text

-.

a g

OYSTER CREEK NUCLEAR GENERATING STATION p m -2:3 w ]

c w f (609) 693-1951 P.O. BOX 388 e FORKED RIVER e NEW JERSEY a 08731 December 17, 1980 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

SUBJECT:

Oyster Creek Nuclear Generating Station Docket No. 50-219 Nonroutine Environmental Ooeratino Report No. 50-219/80-13 This letter forwards two copies of Nonroutine Environmental Operating Report No. 50-219/80-13 in compliance with paragraph 5.6.2 of Appendix B to the Technical Specifications.

Very truly yours, l

ab Ivan R. Finfyock, r.

Vice PresiMnt-Generation i

IRF:dh -

Enclosures l cc: Director (17 copies)

Office of Nuclear Reactor Regulations

, United States Nuclear Regulatory Commission Washington, D. C. 20555 l

l c/o Distribution Services Branch, DDC, ADM l

- G  ??

.E: -

c_

r 8 012230g L _ _ _ . _ . . . _ _ , . , . _ _ . _ _ _ . ____._ _ _._.._m. - -

0 0YSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731-Nonroutine Environmental Operating Report No. 50-219/80-13 Report Date December 17, 1980 Occurrence Date December 4, 1980 Identification of Occurrence

- . . Exceeding a .liraiting-condition.as defined.in the Environmental.IechnicaLSpecifica .~ . -- ..

tion, Paragraph 2.1.4.2, when both operating diultion pumps were tripped out of service with the intake water temperature less than 60 F.

This event is considered to be a nonroutine environmental operating report as defined in the Technical Specifications, Appendix "B", paragraph 5.6.2.

Conditions Prior to Occurrence Steady State Power Dilution Pump Flow: 5.20 E5 GPM Circulating Water Pump Flow 3.45 E5 GPM Circulating Water Pump l-1 out of service.

Description of Occurrence During the week of November 30, 1980 the plant was experiencing abnormally low tides resulting in the securing of a circulating water pump to allow for sufficient suction on the Service Water and Screen Wash Systens. The tide water levei j directly affects the capability of the intake system which supplies cooling l

. water to the Main Condenser, Reactor Building Closed Cooling Water and Turbine Building Closed Cooling Water Systems.

On December 4,1980, the plant intake water level reached a critically low elevation as a result of a combination of extreme low tide and a persistent westerly wind. At 1735 hours0.0201 days <br />0.482 hours <br />0.00287 weeks <br />6.601675e-4 months <br />, the intake water elevation had dropped below the suction to the screen wash pumps. The pumps quickly lost prime and were tripped.

Debris began to accumulate on the traveling screens causing additional water i : decrease at the intake pump's suction. Screens 1-1 and 1-6 were out of service for maintenance. After evaluation of the conditions, the Shift Supervisor

~

ordered the dilution pumps tripped in anticipation of the plant coming off the t line due to the loss of the intake. Dilution pumps 1-2 and 1-3 were manually l tripped and a plant shutdown began at 1758 hours0.0203 days <br />0.488 hours <br />0.00291 weeks <br />6.68919e-4 months <br />. The tripping of the dilution r

pumps allowed the water level at the intake to recover sufficiently to regain suction to the screen wash pumps and allow the intake system to support plant operation. Plant electrical output had been reduced 25 MWe in twelve minutes.

I At 1810 hours0.0209 days <br />0.503 hours <br />0.00299 weeks <br />6.88705e-4 months <br /> the plant shutdown was terminated due to the increase in the intake water level. Dilution pump 1-2 was started at 1821 hours0.0211 days <br />0.506 hours <br />0.00301 weeks <br />6.928905e-4 months <br />. Full power output was achieved at 1837 hours0.0213 days <br />0.51 hours <br />0.00304 weeks <br />6.989785e-4 months <br />. #1-1 and 1-3 dilution pumps remained off.

- m

- _ . . . . . _ _ . . _ . m_., . _ ._ _._ _ _ -

, ,7__._. _ . _._ _

Nonroutine Environmental Operating Report No. 50-219/80-13 Page 2 Again due to low tide conditions dilution pump 1-2 was tripped at 0519 hours0.00601 days <br />0.144 hours <br />8.581349e-4 weeks <br />1.974795e-4 months <br /> on December 5,1980 and circulating water pump 1-1 was started at 0520 hours0.00602 days <br />0.144 hours <br />8.597884e-4 weeks <br />1.9786e-4 months <br />. This was necessary to supply additional cooling water to the Turbine Building Closed Cooling Water heat exchangers which were starting to go air bound. The intake level had decreased to a point where there was insufficient level to run both the circulating pumps and the dilution pumps without jeopardizing the plant's main heat sink. This action was later determined to be contrary to the require-ment of Environmental Technical Specification 2.1.4. Operations personnel in-correctly assumed that operations could continue for a 14 day period (as per Technical Specification 2.l~.4.4) without referring to the actual wording. The incident was discussed later in the day with the NRC and action was taken immediately to put the plant into full compliance. Dilution pump 1-2 was started at 1655 and dilution pump 1-3 was started at 1738 hours0.0201 days <br />0.483 hours <br />0.00287 weeks <br />6.61309e-4 months <br />.

Apparent Cause of Occurrence Unusual Service Condition, including Environmental; Component Failure; Personnel error.

Analysis of Occurrence The purpose of operating two (2) dilution pumps when the intake temperature is below 60 F is to discourage the overwintering of fish in the discharge canal.

It is highly unlikely that the loss of the dilution pumps had any adverse effects on the marine life that presently occupies the discharge canal.

Previous .obser.vations .indicata.that a. plant scram would present.a more . severe .

effect on the marine life of the discharge canal. The trip of the dilution pumps had minimal adverse biological effects.

Corrective Action l Corrective action was restarting dilution pump 1-2 and 1-3.

! New screen wash pumps have been purchased and will be installed shortly. These pumps will have extrapolated. suction. inlet 1.ines which will-extend further sinto -

' - - the water than the present suction lines. In addition, plans are being studied to dredge the intake canal in order to remove obstructions which result in i restricted flow.

The Environmental Technical Specifications are being revised to account for low tide conditions whereby operation of dilution pumps cannot be met without jeopardizing the plant to a loss of heat sink and resultant transient.

l l

l l

t w _= - ~ - -- - -- -

NRC FOBM 366 U. S. NUCLEAR REGULATCGY COMMISSION (7 77), '

,' LICENSEE EVENT REPORT CONTROL BLOCK: l I

l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRFD INFORMATIONI l0 l1l l 8 9 l l l l l l 14 15 l l l l l l LICENSE NUM8ER l l l l 25 l

26 l l l LICENSE TYPE J0 l lhl l 57 CAT Sd l

7 LICENSEE CODE k

CO N'T iOiii  ;=a;I @l q rieioi q 21li9 eii1 2 ,

bD  : :- [@l&iol i12it 171@

6d 69 EVENT DATE 74 75 REPORT DATE 80 7 8 60 61 OOCKET NUMBER EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h l

l0l2l l

[ l l0l3{ l i

l0l4l l 10151 I l l

l 0 l6 l l l

l0l7ll I

10l811 80 7 aa COYP. VA LV E SYSTEM CAUSE CAUSE CODE CODE SU0 CODE COVPCNENT CODE SU9CCCE SUSCODE ioisi 7 8 9 i 1 10 1@ I 11 l@ LJ@ l 12 13 i I I I I l@ l l@ LJ @

18 19 20 SEQUENTI AL OCCUAAENCE REPORT REVISION Year REPORT N3 COCE TYPE NO.

LE R RO O agogTs EVElf"iol l I-I I ci t l3126 24 1-1 27 I

28 I

29 I I 30 I l-j 31 i

32 I

_ 26 22 23 ET D HOURS SB IT FOR 3 B. SUPPLIE MANUF ACTURER TK N AC CN ON PL ANT I

J3 l@l34 l@ l 3d l@ I 36 l@ 3 l I I I 40 I LJ@

41 l

42 l@ l 43 l@ l 44 I I I 47 I@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I

11 101 I l

i1 lii i l

li121I I

l LLLLI I I

11 141 1 80 7 8 9 S  % POWER OTHER STATUS 15 O Y DISCOVERY DESCRIPTION ST li i s i LJ@ l' i I l@l" I I l@l I.

A!TiviTv CO# TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE j RELEASED OF RELEASE I

l i 16 7 8 9 i U@l I@l 10 11 44 i I 45 80 PERSONNEL EXPOSURES NUMBER DESCRIPTION isi2i i i i l@lTYPE i @i i PERSONNEL INJUPIES NuveER oESCRiPTiON@

I li is i I I i l@l12 80 7 8 9 11 LOSS OF OR DAMAGE TO FACILITY TYPE DESCRIPTION I

7 9

8 9 U @l 10 80 l 12iOi ISSUEf@

l l DESCRIPTION i liiiiiiiiiill:

10 68 69 80 5

( 7 8 9 o

NAME OF PREPARER PHONE: $