ML20209D669
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UNITED STATES
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8 NUCLEAR REGULATORY COMMISSION n
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DEC 101984 MEMORANDUM FOR:
George W. Knighton, Chief, Licensing Branch No. 3, DL FROM:
Brian W. Sheron, Chief, Reactor Systems Branch, DSI
SUBJECT:
DIABLO CANYON ALLEGATIONS In response to your memo to me dated November 30, 1984, enclosed is a list of allegations for which the RSB is responsible and their corresponding applica-bility code.
As I have stated in my memo to you dated November 1, 1984, the only outstanding item in the RSB scope of review is to ensure that the RHR system low flow alarms installed in Unit No. 2 are the same design as the alarms installed in Unit No. 1.
Please request the licensee to provide infor-mation on this issue for RSB review.
This information is required to complete our review of allegations No. 39 and 45 applicable to Diablo Canyon Unit 2.
The RSB review of all allegations documented in SSER Nos. 21, 22, and 26 is applicable to both Units 1 and 2, assuming the low flow alarm is installed in both units and the operating procedure is modified to require power be made available to RHR suction valves during Modes 4, 5, and 6 for both units.
I have also stated in my memo to you dated November 1, 1984, that we believe the Unit 2 Technical Specifications should undergo a review to the extent necessary to correct the known deficiencies that have been identified as a result of RSB review on recent Westinghouse NTOL plants.
Please let us know whether or not DL requests RSB to conduct this review and your disposition of this recommendation.
WehavealsocompletedourreviewoftheDiabloCanyonUnit2 allegations 1bitus report attached to the licensee's letter dated November 2, 1984, and concluded that there are no allegations beyond those items. listed in the enclosure, that would require RSB review.
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Brian W. Sheron, Chief Reactor Systems Branch Di' vision of Systems Integration
Enclosure:
As stated cc:
R. Bernero R. Houston T. Novak F. Anderson E. Butler
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RSB Section Leaders CONTACT:
C. Liang, x24754 g
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ENCLOSURE 1 j
DIABLO CANYON UNITS 1 AND 2 LIST OF ALLEGATIONS IN RSB REVIEW SCOPE 1
- i Allegation No.
Application Code RSB Review Status a
39 E
Closed for Unit 1 in SSER 26; requires addi-tional information for Unit 2*
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40 E
Closed in SSER 21 t1 45 E
Closed for Unit 1 in the forth coming SSER 28; requires additional information for Unit 2*
177 E
Closed in SSER 22 261 E
Closed in SSER 26 610 E
Closed in SSER 26 611 E
Closed in SSER 26 612 E
Closed in SSER 26 616 E
Closed in SSER 26
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619 E
Closed in SSER 26 623 E
Closed in SSER 26 i
- In order to close those those items for Unit 2, the licensee should provide confirmation that the RHR low flow alarms have been installed in Unit 2 with the same design as the alarms installed in Unit 1.
Also the Unit 2 oper-ating procedures have been modified to' require power be be made available to the RHR suction valves during Modes 4, 5, and 6.
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