ML20009A857

Forwards LER 81-005/03L-0

ML20009A857
Person / Time
Site:	Point Beach
Issue date:	06/05/1981
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009A855	List: ML20009A854 ML20009A857 ML20009A860
References
NUDOCS 8107140366
Download: ML20009A857 (1)

Text

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40 l Wisconsin Electnc eowra couesur 231 WEST MICHIGAN, MILWAUKEE, WISCONSIN 53201 June 5, 1981 Mr. J. G. Keppler, Regional Director Office of Inspection and Enforcement, Region III U. S. NUCLEAR REGULATORY COMMISSION 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

DOCKET NO. 50-266 POINT BEACH NUCLEAR PLANT, UNIT 1 LICENSEE EVENT REPORT NO. 81-005/03L-0 Enclosed is Licensee Event Report No. 81-005/03L-0 (a 30-day report) with an attachment which provides a description of an event reportable in accordance with Technical Specification 15.6.9.2.B.2, " Conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shut-down required by a limiting condition for operation."

Very truly yours, C. W. Fay,' Director Nuclear Power Department Enclosure Copy to NRC Resident Inspector 8107140366 810702 PDR ADOCK 05000 8 JUL- 6 1981

NRC h ORM $ U. S. NUCLEAR H E GULAT ORY COMMISSION 87-771 .

LICENSEE EVENT REPORT

, CONTROL BLOCK: l l l l l l lh (PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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R E POR T D AT E 7 8 60 69 DOCK ET NUMBER EVENT DESCRIPTION AND PROBABLE CONSECUENCES h l0l2llOn 5-15-81 annual TS testina revealed that the contrni rnnm omorgoney 1 10 l 3 l j filtration system, common to both units , was not operating within TS , ,

I o , lSection 15. 3.12. 2. C, limits. Thus, the subject system was deemed in- I o 3 goperable by TS definition. This condition placed the plant in a degradecl j o is i Imode of operation allowed by the TS. The event had no effect on the _J s

a y lpublic health and safety as the system would have operated, although at I l o is i la lower than design flow rate , to filtrate the control room atmosphere.J DE CODE $ BC E COMPONENT CODE SU8 CODE S E lol9l8 l S l G l@ W@ (_Bj @ l Vl Al L l VI E l Xlh y@ l_G_j 20 7 9 10 11 12 13 18 19 SE QUE NTI AL OCCUARENCE REFORT REVISION

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34 35 36 40 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li l 0 l [The low system flowrates were caused by an improperly bal anced backara f t I i i l damper located at the W14A fan discharae and an improper setting of 4-ho_J

,,,,,  ; balancing dkmper located just upstream of the systems roughing fil te rs . l

, , , ., g ,The dampers were readj usted. The system was retested and found to cer- 1 i , i, i iform satisfactorily and was returned to service on 5-20-81. l C'

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ATTACHMENT TO LICENSEE EVENT REPORT NO. 81-005/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 1 Docket No. 50-266 On May 15, 1981, at 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, during Technical Specification ventilation system performance testing, it was discovered that the fans of the control room emergency filtration system, common to both units, were not operating within plus or minus 10 percent of their designed flow rates as required by Technical Specification, Section 15.3.12.2.C. '

Thus, the control room emergency filtration system was deemed inoperable by Technical Specification definition. This condition placed the plant in a degraded mode of operation allowed by the Technical Specifications.

The event had no effect on the public health and safety as the system would have operated to filter, although at a lower flowrate than originally designed, the control room a tmosphere. In addition, the forced air breathing apparatus was available to the control room personnel to mitigate the consequences of airborne radioisotope contamination of the control room atmosphere.

The overall system flowrate was 3600 scfm while operating on fan W14A, and 4300 scfm while operating on fan W14B. The system design flowrate is 4950 scfm. The low system flowrate, while operating with fan W14A, was caused by an improperly balanced backdraft damper located just downstream of the fan discharge, and an improperly adjusted balancing damper located just upstream of the system's roughing filters.

The low system flowrate, while operating with fan W14B, was caused by the improperly adjusted balancing damper located just upstream of the system's roughing filters.

The backdraft damper was rebalanced and the balancing damper was reset. The system was retested, and found to perform satisfactorily. The system was returned to service at 0700 hours0.0081 days <br />0.194 hours <br />0.00116 weeks <br />2.6635e-4 months <br /> on May 20, 1981.

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