ML20195D766

Forwards Revised Tech Spec Section 3.6.1.7 Re High Containment Pressure Alarms & Containment Pressure Indication,In Response to SER Outstanding Issue 10. Resolution of Issue Should Be Reflected in Next Sser

ML20195D766
Person / Time
Site:	Seabrook
Issue date:	06/03/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Noonan V Office of Nuclear Reactor Regulation
References
SBN-1085, NUDOCS 8606050044
Download: ML20195D766 (4)

Text

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• SEABROOK STATION Engineering Office

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PENHI June 3, 1986 Put2c Service of New Hampshire SBN- 1085 T.F. B7.1.2 l

NEW HAMPSHIRE YANKEE DIVISION United States Nuclear Regulatory Commission Washington, DC 20555 Attention: Mr. Vincent S. Noonan, Project Director PWR Project Directorate No. 5

References:

(a) Construction Permits CPPR-135 and CPPR-136, Dockt.t Nos. 50-443 and 50-444 (b) PSNH Letter (SBN-1004), dated April 15, 1986, " Level Measurement Error (SER Outstanding Issue No.10)",

J. DeVincentis to V. S. Noonan

Subject:

Level Measurement Error (SER Outstanding Issue No.10)

Dear Sir:

During discussions with the NRC Staff on May 21, 1986, the Staff agreed that our methodology for determiaing the level measurement error caused by reference leg heatup [ Reference (b)] was acceptable if qual-ified alarms are provided to alert the operator. Based on this we committed to providing high containment pressure alarms and containment pressure indication, that meet the criteria in FSAR Section 7.5.4.4 for Design Category 1 Accident Monitoring Instrumentation,. prior to exceeding five percent power so that the methodology discussed could be applied to Seabrook Station.

Since the instrumentation committed to above will not be available prior to fuel load, we will also commit to keeping the containment purge valves closed when in Mode 2 under the Low-Power License. Analyses have been performed for a spectrum of break sizes at various power levels using the methodology and assumptions presented in Reference (b) with the containment purge valves closed. The containment temperatures cal-culated are less than 185* when SI is actuated on High-1 containment pressure (5.8 psig). Since the low-low-level setpoint, 17.1%, is cal-culated using a reference leg temperature of 185'F, the level trip can be relied on to mitigate a feedwater line break without operator action.

Attachment A, a revised Technical Specification, Section 3.6.1.7, provides suggested wording to reflect this commitment.

AA B 43 goo {DOCg0hO p

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i Seabrook Station Construction Field Office P.O. Box 700 Seabrook, NH O3874

United States Nuclear Regulatory Commission Attention: Mr. Vincent S. Noonan Page 2 These commitments and the information provided in Reference (b) completes our response to the above referenced SER outstanding issue.

We request that the resolution of this issue be reflected in the next supplement to Seabrook Station's SER.

Very truly yours,

. /tLd John DeVincentis Director of Engineering cc: Atomic Safety and Licensing Board Service List

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ATTACliMENT A CONTAINMENT SYSTEMS -

CONTAINMENT VENTILATION SYSTEM LIMITING CONDITION FOR OPERATION 3.6.1.7 Each containment purge supply and exhaust isolation valve shall be OPERASLE and:

a. Each 35-inch containment shutdown pur;a supply and exhaust isolation alve shall be closed and locked closed, and b.-/r.T 8-inch containment purge supply and exhaust isolation valve (s) '

y-be open-for.up to 1000. hours-during .a _calendat_ year-provided-no-more -than -one -pair -(one-supaly-and-one-exhaus t)-are open-at-one -

-time.- 4.tll b c ces.le J chcsed iant h<.

-c but o.9 be of u for pr3 =#f#" # " yards" mzan.xm ax wit !c.a.e ke.: his h r ju n::ar APCLICASILITY: -

1. 38 ### d le C " A /M a CJa;' 5 es b nh *h r MCDES 1, 2,'3, and 4. fa e f e ts n = I e,'l-] a.n delI/4 2.,csa.ry/

noe ACTION: OS'-c kt rydre thz n/s e ts he :,: e n ,

a. With a 36-inch containment purge supply and/or exhaust isolatica valve open or not locked closed, close and/c- lock close that valve or isolate the penetration (s) within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, othemise te in at least HOT STANCSY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTOCWN within the folicwing 30 hears.

((M- b.

With valve the. 8-inch'*. containment purge supply and/or . ', ~e exha i , ., , ' -,

close,(s) cpen the open 8-inchfor more-than

• valve'(s) *1000*

or isolate *hodrs'ddfing the penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, otherwise bi fri at least HOT STAND 3Y witHn the next (s) .c. h a =a calen 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />, and in COLD SHUTCCWN within the f olicwing 30 hot rs.

c. With a containment purge su:.?l y and/or exhaust isolation valve (s) having a measured leakage rate in excess of the limits c/ Specifica-tions 4.6.1.7.3 and/or 4.6.1.7.4, restore the inoperable valve (s) to OPERASLE status'within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, othemise be in at least HOT STANCSY within the next' 6 hcurs, and in COLD SHUTDCWN within the folicwing 4

30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

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