ML20126D855
| ML20126D855 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/09/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20126D853 | List: |
| References | |
| NUDOCS 9212280188 | |
| Download: ML20126D855 (3) | |
Text
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!' 1.k UNITED STAT Es NUCLEAR REGULATORY COMMISSION y
WASHINGT ON, D. C. 20555
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SAFETY _ EVALUATION BY THE OFFl[E OF NUCLEA!LREACTOR REGULATION RELATED TO AMENDMENT NO.103 TO FACIL11Y OPERATING LICENSE NO. NPF-29 ENTERGY OPERATIONS. INC.. ET AL.
GRAND GULF NUCLEAR STATION. UNIT 1 QQCKET N0. 50-416 1.0 JNTRODUCTIM By letter dated May 30, 1991, Entergy Operations, Inc., the licensee for Grand Gulf Nuclear Station (GGNS), Unit 1, proposed to amend the Technical Specifications (TS) Table 3.3.7.5-1 to increase the allowed outage times for the containment hydrogen analyzers and monitors.
The proposed amendment also changes the time limit at which an inoperable radiation monitor becomes reportable per TS 6,9.2.
The proposed changes are consistent with the guidance of Generic Letter (GL) 83-36.
Specifically, for the hydrogen analyzers and monitors, the licensee has proposed to increase the restoration times for operable channels one less than the minimum from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to 7 days and for the operable channels one less than the required numbers from 7 to 30 days.
For the radiation monitor, a special report to the Commission is required pursuant to TS 6.9.2 within 14 days of the event if the number of operable channels for the monitor is one less than the minimum and if one channel is not restored within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The licensee proposed to increase ihis time limit for restoration from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 7 days. No change is proposed to the preplanned alternate method of monitoring the appropriate parameters within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> if the operable channel is one less than the minimum.
2.0 EVALUATION The licensee indicated that the existing TS associded with accident monitoring are consistent with the original recommendations of NUREG-0578, "lM1-2 Lessons Learned Task Force Status Report and Short-Term Recommendations." However, the TS do not reflect the more recent gtddance contained in GL 83-36.
The proposed TS changes are consistent with GL 83-36, which identified several TS requirements, including the requirements affected by this amendment request, that could be relaxed.
The relaxed requirements would still provide sufficient time to perform required maintenance and surveillance testing without increasing the consequences of an accident.
9212200188 921209 PDR ADOCK 05000416 p
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, The licensee stated that th., instrumentation associated with the_ proposed changes serves no automatic accident mitigation function. but:provides.
operator information following a postulated accident. Approved Emergency-Operating Procedures currently in use give specific guidance to the o>erator-in the event the hydrogen monitors are not available. Compliance witi the proposed ACTIONS of the TS provides adequate _ compensatory measures'such as POST ACCIDENT Sampling System (PASS) samples and grab samples for obtaining an adequate atmospheric sample of the drywell and containment to mitigate-degradation of containment from potential hydrogen combustion.
The proposed changes would not affect the-ability to obtain an indication of hydrogen concentration, only the response time for obtaining this i_nformation.
Therefore, the proposed change would not significantly increase the probability or consequences of an accident previously evaluated.
Nor would the proposed change create the possibility of a new or'different kind of accident from any previously analyzed as no new modes of plant operations are introduced.
The licensee also indicated that the time limit for writing a Special Report on inoperable radiation monitors does not aid in restoring the instrument to OPERABILITY, but only imposes an additional administrative-task with no commensurate improvement in safety.
The proposed change is also supported by GL 83-36.
The staff has reviewed the licensee subm'ittal as discussed above and find's that increasing the allowed outage times for the containment analyzers and monitors and extending the time limit for reporting inoperable radiation monitors are consistent with the guidance of GL 83-36 and do not involve a reduction in the margin of safety and, therefore, are acceptable.
Therefore, the staff concludes that the proposed TS changes to Table 3.3.7.5-1 are acceptable.
3.0 STATE CONSULTATION
In accordance with-the Commission's regulations, the Mississippi State official was notified of the proposed issuance of-the amendment.
The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendment changes a requirement'with respect to installation or use of a facility component-located within the restricted area as definediin 10 CFR:
Part 20 and changes surveillance requirements. The NRC staff has determined that the amendment involves no significant: increase _in the amounts,-
and no significant change'in the types, 'of any effluents' that mayj be-released--
offsite,J and that there;is no significant increase'in-individual or cumulative occupational radiation exposure. The Commission __ has previously issued a proposed finding that the amendment' involves no significant hazards consideration,-and there has-been no public comment on such finding 2
. consideration, and there has been no public comment on such finding (56 FR 43808). Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant 1to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendment.
5.0 CONCLUSION
The Commission has concluded, based on the considerations discussed abo /e.
that:
(1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor:
R. Goel Date: December 9, 1992
.