ML20010B096

Technical Evaluation of Response to Position 5 of Item II.E.4.2 of NUREG-0737,Containment Isolation Setpoint for Fort Calhoun Nuclear Power Plant

ML20010B096
Person / Time
Site:	Fort Calhoun
Issue date:	05/31/1981
From:	Broderick N, Ruvalcaba W, Wade W LAWRENCE LIVERMORE NATIONAL LABORATORY
To:
Shared Package
ML20010B090	List: ML20010B096
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.E.4.2, TASK-TM NUDOCS 8108130330
Download: ML20010B096 (3)

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Energy Measurements Group Sari Ramon Operations SRO-250 May 19cl TECHNICAL EVALUATION OF THE RES?ONSE TO POSITION NO.5 OF ITEM 3I. E. 4.2 OF NUREG-0737 CONTAINMENT ISOLATION SETPOINT FOR THE e

FORT CALHOUN NUCLEAR POWER PLANT COC CK ET NC. SC-OSS)

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• This document is UNCLASSI.:IED Dari vati va 05 assifier: $< d M M./

~ 31cnotas i: srecericx Decar: men: Manager 8108130330 810728 PDR ADOCK 05000285 P

PDR v 'orm Performec {cr Lawrence Livermore Naticesi Lacoratcry uncer U.S. O ecar ment of Energy Centrac Nc. O E. ACO S-7d NVC ~183.

9 INTRODUCTION AND BACKGROUND As a consequence of tne incident at TMI-2, implementation of a numcer of new recuirements nas been reconnended for operating reac:ces.

Tnese new requirements are described in NUREG-0560, "NRC Action Plan Uevel-oped as a Result of :ne TMI-2 Accident," May 1950, and NUREG-0737, "Clari-fication of TMI Action Plan Requirements," Nove=cer 1980.

Tne NRC staff nas also requested licensees to suomit information sufficient to permit an indepencent evaluation of tneir response to :nese new requirements.

Inis recort provides an evaluation of tne response to Actica Plan Item II.E.4.2, position 5, by :ne designated licensee.

DESICi BASIS OR REVIEW CRITERIA Position 5 requires :na :ne cantainment Oressure se::oin:

na:

initiates c:ntainment isolation for non-essential systam containmen vessel penetrations be at, Or recuced to, "...the minimum compa-iole i:n normal operating c:ncitions."

e TECHNICAL EVALUATION Res?cnse evaluation is cased uce.n :ne values pr0vicec f:r ne foll: wing parameters:

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ine maximum 0:servec or ex:ec:ec containmen pressure -

curing ncroal operation.

(2)

Tne 1::: errer anc ::servec crif: n ne :ressure sensing ins rumen a- :n :r:.::ing :ne iscia::en s;;na; (see n, e).

(3)

Tne containment isciatica pressure sa :oin:.

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NOTE: T' e clarification Occument (NUREG-0737) roviced 0-ly n

ne ex:ec ac margin f r instrumen: error anc cic nc:

s:ecify acceptacle values for inst.umen: crif; cr a mospneric cnanges contricuting_ :o :ne stal sensing loco eraer.

Acc1:icnal staff guidance estaolisnec a l i t ' *. of 3.0 psi for an isola-ion se: point margin over l

ne normal containment pressure to accour.: for total loop ef or.

In aceition, for sumatmosoneric contain-J ments, a 3.0 psi se point margin over atmospneric i

pressure is also c:nsicerec acceptable.

In consideration of these values, :ne isolation pressure se: point is to be as low as practical wi nout increasing :ne procacility of inaaver-l tent activation of tne isolation signal.

CONCLUSIONS-The letter of Decemoer 31, 1980, suomi;;ec sy C=ana Puolic Power Di stri ct. provided sufficient information to concluce nat :ne.c:ntainment l

isolatien pressure se: point for For. Calnoun Nuclear ? wer Plan: meets :ne l

NUREG-0660/0737 requirements and is witnin :ne accitional limiting guice-lines proviced by :ne NRC staff, it

ENCLOSURE 8

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CONTAINMENT SYSTEMS LIMITING CONDITION FOR OPERATION

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3.6.1.7 The containment purge supply and exhaust isolation valves may be open for safety-related reasons [or chall be locked closed]. The cc.tainment vent line isolation valves may-be open for safety-related reasons [or shall be locked closed).

APPLICABILITY:

MODES 1, 2, 3, and 4.

ACTION:

(For plants with valves closed by tecnnical spe,cification)

With one containment purge supply and/or one exhaust isolation valve open, close the open valve (s) within one hour or be in' at least HOT STA"D3Y 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 SHUTOOWN within the following 30 h:urs.

(For plants with valves that may be opened by techn1{ cal specifications) 1.

With one containment purge supply and/or o.ne exhaust isolation or vent val,e inoperable, close the associated OPERABLE valve and either restore the inoperable val /e to CPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or lock -the C?ERABLE valve closed.

Operation ty then continue until cerformance of the next required 2.

valve :est provided tha: the OPERA 5LE valve is verified to be locked closed at least cnce per 31 days.

3.

Otherwise, be in at least HOT STAND 3Y within the next six hours and in COLD SHUTOCWN wi-hin the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

The provisions of Specification 3.0.4 are not applicable.

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SURVEILLANCE REOUIREMENTS

-inch containment purge supply and exhaust isolation valves a.5.1.7.1 ine

-inen vent line isolation valves shall be determined locked closed

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and the -

at least ence per 31 days.

4.5.1.7.2 The valve seals of the purge supply and exhaust isolation valves and the vent line isolation valves shall be replaced at least one per ___ years.

3/4 6'-10