ML20209D801
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UNITED STATES y
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January 22, 1985 MEMORANDUM FOR:
D. M. Crutchfield, Assistant Director for Safety Assessment, DL FROM:
R. Wayne Houston, Assistant Director for Reactor Safety, DSI i
SUBJECT:
COMPLETION OF REVIEW 0F TECHNICAL SPECIFICATIONS FOR DIABLO CANYON, UNIT 2 Plant Name:
Diablo Canyon Nuclear Power Plant, Unit 2 Docket No.:
50-323 Licensing Stage:
0L NSSS Supplier:'
Westinghouse Architect / Engineer: Pacific Gas and Electric Company Containment Type:
Dry Responsible Branch: LB #3 Project Manager:
H. Schierling Review Status:
Complete In response to your request by memorandum dated December 17, 1984, the Containment Systems Branch (CSB) has completed its review of Section 3/4.6, Containment Systems, of the subject Technical Specifications (TS). This review was performed with an emphasis on assuring that the TS are consistent with the Diablo Canyon FSAR.
He find proposed TS Section 3/4.6 to be acceptable, because it is consistent with the Diablo Canyon FSAR, except as noted in the enclosed comments. Note, however, that we have not reviewed TS 3/4.6.2.2, Spray Additive System, as it is not in the CSB review area.
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R. Wayne Houston, Assistant Director for Reactor Safety, DSI
Enclosure:
As stated cc:
T. Novak G. Knighton E. Butcher MC. Moon K. Pulsipher r
CONTACT:
P sipher, CSB: DSI
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CONTAINMENT SYSTEMS BRANCH COMMENTS ON DIABLO CANYON, UNIT 2 TECHNICAL SPECIFICATIONS 1.
Technical Specification 3.6.1.4, Internal Pressure. The proposed lower limit on containment internal pressure is -3.5 psig. This is inconsistent with the minimum containment pressure analysis done to assess the performance capability of the ECCS, as required by Appendix K to 10CFR50. The FSAR analysis assumes as an initial condition, that the containment internal pressure is 14.7 psia (0 psig).
If the initial containment pressure is lower than atmospheric pressure, as allowed by the proposed Technical Specification, the resulting containment pressure during a LOCA could be lower than that calculated in the FSAR, which is nonconservative for the Appendix K ECCS performance analysis (it could ultimately result in higher fuel clad temperatures).
The staff believes that proposed Technical Specifications for process variables should be derived from the initial ' conditions assumed in the safety analyses, including clearly specified uncertainty margins.
2.
Technical Specification 4.6.3.2.b.
This Technical Specification should be corrected as shown on the attached sheet.
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CONTAINMENT SYSTEMS l
3/4.6.3 CORTAINMENT ISOLATION VALVES LIMITING CONDITION FOR OPERATION 3.6.3 The containment isolation valves specified in Table 3.6-1 shall be OPERABLE with isolation times as shown in Table 3.6-1.
APPLICABILITY:
MDDES 1, 2, 3, and 4.
ACTION:
With one or more of,.the isolation valve (s) specified in Table 3.6-1 inoperable, maintain at least one isolation valve OPERABLE in each affected penetration that is open and:
a.
Restore the inoperable valve (s) to OPERABLE status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, or b.
Isolate each affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> by use of at least one deactivated automatic valve secured in the isolation position, or c.
Isclate each affected penetration within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> by use of at least one closed manual valve or blind flange; or d.
Be in at least HOT STANDBY 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 SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE REQUIREMENTS 4.6.3.1 The isolation valves specified in Table 3.6-1 shall be demonstrated OPERABLE prior to returning the. valve to service after maintenance, repair or replacement work is performed on the valve or its associated actuator, control or power circuit by performance of a cycling test, and verification of isolation time.
4.6.3.2 Each isolation valve specified in Table 3.6-1 shall be demonstrated CPERABLE at least once per 18 months by:
Verifying that on a Phase "A" Isolation test signal, each Phase "A" a.
isolation valve actuates to its isolation position; b.
Verifying that on a Phase "B" Isolation test signal, each Phase "B" isolation valve actuates to osition; and sf
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Verifying that on a Cont &inment Ventilation Isolation test signal,.
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each containment vcntilation.ic;lation valve actuates to its isola-tion position.
DIABLO CANYON - UNITS 1 AND 2 3/4 6-15
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