ML20204C925
| ML20204C925 | |
| Person / Time | |
|---|---|
| Issue date: | 03/18/1999 |
| From: | Wen P NRC (Affiliation Not Assigned) |
| To: | Sepp H WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| References | |
| TAC-MA3494, NUDOCS 9903240033 | |
| Download: ML20204C925 (4) | |
Text
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March 18,1999 Mr. Henry A. Sepp, Manager Regulatory and Licensing Engineering Westinghouse Electric Corporation Mail Stop ECE 4-07A Post Office Box 355 Pittsburgh, Pennsylvania 15230-0355
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR WESTINGHOUSE TOPICAL REPORT WCAP-12472-P-A, ADDENDUM 1, " BEACON CORE MONITORING AND OPERATING SUPPORT SYSTEM"(TAC No. MA3494)
Dear Mr. Sepp:
By letter dated May 13,1996, Westinghouse submitted topical report WCAP-12472-P-A, Addendum 1 for NRC review. The staff has reviewed the report and determir.ed a need for additional information. The enclosure to this letter identifies the information required. Please address your response to the NRC Document Control Desk.
If you wish to meet with the staff to accelerate the information transfer, the staff would welcome such a meeting at a mutually convenient time. If you have any questions on this matter, I may be contacted by phone, 301/415-2832, or by e-mail, pxw@nrc. gov.
Sincerely, Original Signed By:
Peter C. Wen, Project Manager Generic Issues and Environmental Projects Branch
.- Office of Nuclear Reactor Regulation
Enclosure:
Questions on topical report WCAP-12472-P-A, Addendum 1 cc: See next page Q
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f March 18,1999 Mr. Hrnry A. Srpp, Man!ggr Regulatory and Licensing Engineering Westinghouse Electric Corporation Mail Stop ECE 4-07A Post Office Box 355 Pittsburgh, Pennsylvania 15230-C355
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR WESTINGHOUSE i
TOPICAL REPORT WCAP-12472-P-A, ADDENDUM 1, " BEACON CORE MONITORING AND OPERATING SUPPORT SYSTEM" (TAC No. MAM94) 1
Dear Mr. Sepp:
1 By letter dated May 13,1996, Westinghouse submitted topical report WCAP-12472-P-A, Addendum 1 for NRC review. The staff has reviewed the report and determined a need for additionalinformation. The enclosure to this letter identifies the information required. Please address your response to the NRC Document Control Dask.
[
If you wish to meet with the staff so accelerate the information transfer, the staff would welcome such a meeting at a mutually convenient time. If you have any questions on this rratter, I may l
be contacted by phone, 301/415-2832, or by e-mail, pxw@nrc. gov.
Sincerely, Original Signed By:
Peter C. Wen, Project Manager Generic issues and Environmental Projects Branch Office of Nuclear Reactor Regulation
Enclosure:
Questions on topical report WCAP-12472-P-A, Addendum 1 cc: See next page DISTRIBUTION:
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1 March 18,1999 I
Mr. Henry A. Sepp, Manager Regulatory and Licensing Engineering Westinghouse Electric Corporation Mail Stop ECE 4-07A Post Office Box 355 Pittsburgh, Pennsylvania 15230-0355
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR WESTINGHOUSE TOPICAL REPORT WCAP-12472-P-A, ADDENDUM 1, " BEACON CORE MONITORING AND OPERATING SUPPORT SYSTEM"(TAC No. MA3494)
Dear Mr. Sepp:
By letter dated May 13,1996, Westinghouse submitted topical report WCAP-12472-P-A, Addendum 1 for NRC review. The staff has reviewed the report and determined a need for additionalinformation. The enclosure to this letter identifies the information required. Please address your response to the NRC Document Control Desk.
l if you wish to meet with the staff to accelerate the information transfer, the staff would welcome such a meeting at a mutually convenient time. If you have any questions on this matter, I may be contacted by phone,301/415-2832, or by e-mail, pxw@nrc. gov.
Sincerely, Rd. c. W Peter C. Wen, Project Manager Generic issues and Environmental Projects Branch Office of Nuclear Reactor Regulation
Enclosure:
Questions on topical report WCAP-12472-P-A, Addendum 1 cc: See next page
c
?
Rcqu:st for Additional Information for the Westinghouso BEACON
. ^
Topical Report, WCAP-12472-P-A, Addandum 1.
1.
Topical Report WCAP-12472-P-A, Addendum 1 extends the previously licensed BEACON power distribution monitoring methodology to plants containing self-power fixed incore detectors (SPD). The approved Topical Report WCAP-12472-P-A includes detailed Technical Specifications as discussed in Section 7 of the report. However, the i
Technical Specifications listed in Section 7 is based on the Westinghouse Standard Technical Specificaticn (STS) Rev.5. Please provide the typical BEACON Technical Specifications for plants containing self-power fixed incore detectors that is based on Babcock and Wilcox plants (reference to NUREG-1430) or Combustion Engineering plants (reference to NUREG-1432).
2.
Are the detector uncertainties, limits and restrictions for the fixed incores the same as those for the movable incore detector system?
3.
The criteria for the movable incore neutron detectors, with BEACON operable, which are presented in the example of WCAP-12472 COLR Section 2.5, require at least 75-percent available at beginning of cycle and a minimum of 50-percent at any time afterward, with.a minimum of two per quadrant. Discuss the appropriate criteria for the self-power fixed incore detectors. The requirements should be included in the proposed Technical Specifications.
4.
How are failed self-power fixed incore detectors identified? How will it be assumed in the BEACON analysis?
5.
The typical fixed incore detector assemblies are to be top mounted and located within inches of the Control Rod Drive Mechanism coil stacks. A concern was raised that the small fixed incore detector signals may be affected by the potentially large electromagnetic field generated by the Control Rod Drive Mechanism coils. The Rod Position Indication Detector coils is also a potential source of electromagnetic interference. Please provide appropriate recommendations to address this concern.
6.
It is the staff understanding that SPDs are required to be operable all the time, instead of part-time as in the Westinghouse case. What is the difference in the operability requirement between the present system (movable incore detector system) and the proposed system (fixed incore detector system)?
7.
Will the excores/ thermocouple system still be used as backup system on Westinghouse plants and non-Westinghouse Plants for incore monitoring?
8.
WCAP-12472-P-A contains information pertaining to the detector system description and qualification for the movable incore detector system. Please provide similar information for the fixed incore detector system.
ENCLOSURE i
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Mr. Nicholas Liparulo, Manager Equipment Design and Regulatory Engineenng Westinghouse Electric Corporation Mail Stop ECE 4-15 P.O. Box 355 Pittsburgh, PA 15230-0355 Mr. Jack Bastin, Director Regulatory Affairs Westinghouse Electric Corporation 11921 Rockville Pike Suite 107 Rockville, MD 20852 Mr. Sumit Ray, Manager Fuel Licensing & Core Analysis Westinghouse Electric Corporation PO Box 355 Pittsburgh, PA 15230-0355 j
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