ML20024E259

LER 83-033/03L-0:on 830620,fire Detection Zone Reactor Coolant Pump 1-2,containment Level 603 Ft Alarmed & Could Not Be Reset.Caused by Faulty Detector String.Zone Will Be Restored During Next Refueling outage.W/830801 Ltr

ML20024E259
Person / Time
Site:	Davis Besse
Issue date:	08/01/1983
From:	Momenee C, Murray T TOLEDO EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
K83-1076, LER-83-033-03L, LER-83-33-3L, NUDOCS 8308100134
Download: ML20024E259 (3)

Text

Mic .dORfu 366 U. S. NUCLEAR REGULATCRY COMMISSION (7-77) * .

SPECIAL REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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7 8 60 61 DOCKET N'3MBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo l2l l (NP-40-83-02) On 6/20/83, fire detection zone Reactor Coolant Pump (RCP) 1-2, contain-j I O l a i 1 ment level 603', wcnt into alarm and could not be reset. This was determined to be a l

[o ;4 l l false alarm since the redundant fire detector in the zone was not in alarm, and no l loi3i ; equipment failures were indicated in the alarmed zone. This Special Report is being l l o is i l submitted per action statement (b) of T.S. 3.3.3.8. There was no danger to the l jol7l l health and safety of the public or station personnel. Additional smoke detectors in l l cia l l this fire detection zone are operable. l 7 8 9 80 DE CODE S 8C E COMPONENT CODE SUSC00'E SU E l0191 lA lB l@ gg l X lQ lI lN lS lT lR lU [g ]g ]g 7 8 9 10 11 12 13 18 19 20

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21 22 23 24 26 27 28 29 30 31 32 TK N AC O ON PL NT ME HOURS 22 S8 i FOR 8. SUPPLIE MANUF CTURER l33X I@[XJg 34_ l35Z [g l36Z [g 3l70l9l0l 40 l gg 41 gg 42 gg 43 lZl9l9l9[g 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 I i l o l l Since fire detection zone RCP 1-2 is located in containment and presently inaccessible; frTTl I the exact cause has not been determined. However, the cause of the alarm was found I g l to be a problem with the detector string. MWO 83-3697 has been written to restore l

, 3 l fire detection zone RCP 1-2 to service during the next refueling outage. l l

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- 7 8 9 80 ST S  % POWER OTHER STATUS RY DISCOVERY DESCRIPTION l A lgl Operator observation j i s J@ l 9 l 9 l 1 l@l NA l ACTIVITY Co TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE l

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SPECIAL REPORT: NP-40-83-02 DATE OF EVENT: June 20, 1983 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Fire Detection Zone (FDZ) Reactor Coolant Pump (RCP) 1-2, elevation 603', went into alarm Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWt)

= 2526 and Load (Gross MWe) = 830.

Description of Occurrence: On June 20, 1983, FDZ RCP 1-2, containment level 603', went into alarm and could not be reset. The Shift Supervisor determined that this alarm was false since the redundant fire detector in that zone was not in alarm, and no equipment failures were indicated in the alarmed zone.

The inoperability of smoke detectors in FDZ RCP 1-2 placed the unit in action statement (b) of Technical Specification 3.3.3.8, which requires restoring the inoperable instruments to operable status within 14 days, or in lieu of any other report required by Technical Specification 6.9.1 prepare and submit a Special Report to the Commission pursuant to Techni-cal Specification 6.9.2 within the next 30 days. Since FDZ RCP 1-2 is inaccessible due to being located in containment, the smoke detectors in' FDZ RCP 1-2 remain inoperable.

Action Statement (a) of Technical Specification 3.3.3.8 was not applicable since it requires the establishment of a fire watch patrol within one hour to inspect only accessible zones. However, at the time FDZ RCP 1-2 was determined to be inoperable, an hourly fire watch patrol was established on the fire detection panel C4720A.

Designation of Apparent Cause of Occurrence: Due to the inaccessibility of the smoke detectors in FDZ RCP l-2, the exact cause has not been determined. However, it was determined that the fault was in the detector string.

Analysis of Occurrence: There was no danger to the health and safety of the public or station personnel. The redundant smoke detectors in FDZ RCP 1-2 are operable and will provide adequate warning in the event of a fire in the area.

Corrective Action: Maintenance Work Order (MWO) 83-3696 was performed to temporarily clear the alarm from the fire detection panel. MWO 83-3697 was written to restore FDZ RCP 1-2 to service during the next refueling outage.

Failure Data: There has been one other failure of a fire detection zone which was reported in Special Report NP-40-83-01 (83-025).

LER #83-033

. e TOLEDO

%sm EDISON August 1, 1983 Log No. K83-1076 File: RR2 (NP-40-83-02)

Docket No. 50-346 License No. NPF-3 Mr. James G. Keppler Regional Administrator, Region III Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

Special Report 83-033 Davis-Besse Nuclear Power Station Unit 1 Date of Occurrence: June 20, 1983 Enclosed is one copy of Special Report 83-033 which is being submitted in accordance with Technical Specification 6.9 to provide 30 day written notification of the subject occurrence af ter the instrument has been inoperable for 14 days.

Yours truly, QvTL W '

./ eq Terry D. Murray g

Station Superintendent Davis-Besse Nuclear Power Station l TDM/lj k l

Enclosures l

( cc: Mr. Walt Rogers NRC Resident Inspector l

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THE TOLEDO EDISON COMPANY EDISON PLAZA 300 MADISON AVENUE TOLEDO. OHIO 43 4 M

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