ML20004F170

LER 81-005/03L-0:on 810515,control Room Emergency Filtration Sys Fans,Common to Both Units,Found Operating Outside Design Flow Rates Per Tech Specs.Caused by Improperly Balanced Backdraft Damper at Fan Discharge.Dampers Readjusted

ML20004F170
Person / Time
Site:	Point Beach
Issue date:	06/05/1981
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20004F163	List: ML20004F162 ML20004F170
References
LER-81-005-03L, LER-81-5-3L, NUDOCS 8106160577
Download: ML20004F170 (2)

Text

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NRC FORJ 364 U. S. NUCLEA"3 CE[UI.ATORCO ISSION (7 77)

~ . LICENSEE EVENT REPORT I CONTROL 8 LOCK: l l l l l l (PLEASE PRINT C2 TYPE ALL RE!UIZED INFOIMATION) l'O {T) l l@

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7 LICENSEE COCg 14 LICENSE NUM8ER 25 26 LICENSE TYPg JO $7 CAT 68 CON'T LOlil

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EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h ITTIl ion 5-15-81 annual TS testino revealed t-hac +-h o enn+rn1 rnnm omnrgnncy 1 i o i3, l filtration system, common to both units , was not operating within TS , I g lSection 15.3.12.2.C, limits. Thus, the subject system was deemed in- I g rin ioperable by TS definit ion. This condition placed the plant in a degradecl O s imode of operation allowed by the TS. The event had no effect on the l l0 ; 7 l lpublic health and safety as the system would have operated, although at I i o ,, , ia lower than design flow rate , to filtrate the control room atmosphere. l

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44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS g frhe low system flowrates were caused by an imorocerly balancoa hnckaraft1, g i amper d located at the W14A fan discharge and an improcer set +ing nf *hn I

,  ; balancing damper located just upstream of the systems roughing filters. I g lThe dampers were readjusted. The system was retested and found to cer- I g i orm f satisf actorily and was returned to service on 5-20-81.

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7 8 9 S'T  % POWER OTNER STATUS DIS O RY OlSCOVERY DESCRIPTION l l_B,j@lTe ch . Spec. Testina l l 'i s W@

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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 cperated to filter, although at a lower flowrate than origin. illy designed, the control room atmosphere. In addition, the torced 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 dischar e, and an improperly adjusted balancing damper located jus' upstream of the system's roughing filters.

The low system. flow;ste, while operatjng 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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