ML20057A184
| ML20057A184 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 08/31/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20057A183 | List: |
| References | |
| NUDOCS 9309130165 | |
| Download: ML20057A184 (3) | |
Text
_
p ncy[t
/
UNITED STATES
[4 i42ifij NUCLEAR REGULATORY COMMISSION y
WASHINGTON. D.C. 20555-0001 gv f
=..
- i SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 82 TO FACILITY OPERATING LICENSE NO. DPR-10 I
AND AMENDMENT NO. 81 TO FACILITY OPERATING LICENSE NO. DPR-82 j
l PACIFIC GAS AND ELECTRIC COMPANY l
DIABLO CANYON NUCLEAR POWER PLANT. UNITS 1 AND 2 DOCKET NOS. 50-275 AND 50-323
1.0 INTRODUCTION
By letter of May 14, 1993, Pacific Gas and Electric Company (or the licensee) submitted a request for changes to the Technical Specifications (TS). The proposed amendments would change Technical Specification 3.3.1, " Reactor Trip System Instrumentation," regarding the Reactor Protection System to correct a i
typographical error in Table 3.3-1, Action 26.
t 2.0 EVALUATION i
The NRC staff has evaluated the proposed change and has concluded that it is acceptable. The staff's evaluation is given below:
In license amendment request (LAR) 90-05, dated July 17, 1990, PG&E requested a revision to TS 3.3.1 and TS 3.3.2, " Engineered Safety Features Actuation 1
System Instrumentation," to increase the surveillance test intervals and allowed outage times (A0T). As stated in LAR 90-05, Attachment A, Section A, i
" Description of Amendment Request," one of the specific changes requested for the Reactor Protection System (RPS) automatic trip and interlock logic was:
Add new Action 26 to allow 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> to restore an inoperable channel to operable status before requiring shutdown to 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 to allow bypass of a channel for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing, providing the other channel is operable.
However, PG&E inadvertently omitted the words "the next" from the TS marked-up page for Action 26 in LAR 90-05. On May 23, 1991, the NRC issued License Amendment (LA) Nos. 61 and 60 that approved LAR 90-05 with the TS change as it was proposed.
Currently Action 26 reads as:
With the number of OPERABLE Channels one less than the Minimum Channels OPERABLE requirement, restore the inoperable channel to i
OPERABLE status within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> or be in at least HOT STANDBY 9307130165 930831 PDR ADDCK 05000275 p
PDR J
p l
within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />; however, one channel may be bypassed for up to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for surveillance testing per Specification 4.3.1.1, provided that the l
other channel is OPERABLE.
The change that is requested by PG&E is consistent with the Westinghouse WCAP-10271, "EvRation of Surveillance Frequencies and Out of Service Times for the Reactor otection Instrumentation System," WCAP-10271, Supplement 1, and WCAP-10271, Supplement 2 (Revision 1), " Evaluation of Surveillance Frequencies and Out of Service Times for the Engineered Safety Features Actuation System." Specifically, WCAP-10271, Supplement 1, lists recommended TS changes for the Reactor Trip System Instrumentation.
The NRC approved the action statement generically for the RPS automatic trip i
and interlock logic in NRC Safety Evaluation Report (SER) dated April 30, 1990, regarding, " Westinghouse Topical Report WCAP-10271 Supplement 2, Revision 1, ' Evaluation of Surveillance Frequencies and Out of Service Times for the Engineered Safety Features Actuation System,'" Section 5.0, l
" Conclusions."
Also, the SER issued for LAR 90-05 (LA Nos. 61 and 60) explicitly accepted the 12-hour A0T as documented in Section 2.0, " Evaluation," Item 4), "the A0T for l
maintenance of all components may be extended to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />."
As discussed above, because the correction of the Technical Specification i
regarding Reactor Protection System instrumentation was previously reviewed and approved as documented in the NRC's SER dated April 30, 1990, the NRC staff finds the change acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the California State official was notified of the proposed issuance of the amendments. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
These amendments change a requirement with respect to the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes surveillance requirements. The NRC staff has determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released i
cffsite, and that there is no significant increase in individual or cumulative l
occupational radiation exposure. The Commission has previously issued a proposed finding that the amendments involve no significant hazards considera-tion, and there has been no public comment on such finding (58 FR 39057).
Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of the amendments.
\\
. _.. _ ~. -.
ls e
5.0 CONCLUSION
The Commission has concluded, based on the considerations discussed above, i
that (1)'there-is reasonable assurance that the health and safety of the i
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: Andrea Wilford l
Date: August 31, 1993 l
l i
i i
r e
.v..,..