ML20002C470
| ML20002C470 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point File:Consumers Energy icon.png |
| Issue date: | 03/10/1975 |
| From: | Lamley R, Sewell R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20002C471 | List: |
| References | |
| NUDOCS 8101100346 | |
| Download: ML20002C470 (3) | |
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73 March 10, 1975
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.Re: Docket 50-155 a#
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Licence DPR-6 Division of Reactor Licensing O
Big Rock Point US Nuclear Regulatory Commiscion Tech Specs Washington, DC 20555 Change Request Gentlemen:
On August 15, 1974 Consumers Power Company submitted a report entitled, " Big Rock Point Plant Reactor Depressurization System Descrip-tion, Operation and Performance Analysis." At the time that report was submitted, Section 8.2, Periodic Testing, was not included as it had not been completed. A tasting program has now been developed. The proposed testing is incorporated in the attached request for change to the Technical Specifications of License DPR-6, Docket 50-155. Three (3) executed and 4
thirty-seven (37) conformed copies of this request are herewith transmitted.
During conversations in the fall 1974 with a member of the Regula-tory staff, a question was asked regarding the consequences of inadvertent blowdown through n 1-1/2 inch bypass line that is included in the system.
Inadvertent blowdown through this bypass line would result in a blowdown rate of approximately seven (7) pounds per second at normal operating pres-sures and temperatures. Consumers Power Company has calculated that for a five (5) minute duration blowdown the dose due to Iodine 131 (milk) would be approximately 35 mrem. Similarly, the outside exposure calculated due to noble gases (ree::ptor at site boundary) is about 25 mRen for a five (5) hour duration of release. Both dose calculations assumed primary coolant activity levels were at the Technical Specifications limits.
The August 5 determination, regarding a variance from the require-ments of the Interim Acceptance Criteria, provided an extension of time un-til March 1,1976 for installation of the RDS system at the Big Rock Point Plant and required reporting of the results of an investigation into means for improving ECCS reliability, including provisions for manual depressuriza-tion of the primary coolant system. In addition, it also required Consumers Power Company to report periodically, but not less than once every three (3) months, its efforts in attempting to acM eve compliance with the IAC. By letters dated October 31, 1974 and Decetuer 30, 197k, Consumers Power Com-pany reported its efforts to achieve compliance with the IAC. In addition, both letters described the results of investigations of other methods for
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Pivision of Reactor Licincing 2
Big Rock Point March 10, 1975 improving ECCS reliability, including interim provisions for manual depres-surization of the primary coolant system. As a further update, the manual actuation system (msnual depressurization of the primary coolant system) preliminary engineering studies have been completed to a point where a manual actuation system cen be installed during fall 1975 if the automatic actuation system is not available. Since we presently have confidence that the automatic actuation system will be available in the fall of 1975, we have discontinued engineering work upon the manual actuation system.
This work will be started on a schedule which will allow installation dur-ing fall 1975 if the fabrication and delivery schedule of the automatic actuation system is delayed beyond the fall of 1975 In addition, our December 30, 1974 letter stated that we were reviewing the August 15,197h report, " Big Rock Point Plant Reactor Depres-surization Systmn Description, Operation and Performance Analysis" to de-termine if the change in actuation system vendor necessitated significant revision to the report. We have not completed this review. We vill advise the Regulatory staff when this review is complete.
Yours very truly, Mfr$. 0),\\ ' ;x< u $ l J
1 RBS/ce Ralph B. Sewell Nuclear Licensing Administrat)r CC: JGKeppler, USNBC l
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(a CONSUMERS POWER COMPANY Docket 50-155 Request for Change to the Technical Specifications License DPR-6 The following changes to the Technical Specifications of License DPR-6 issued to Consumers Power Company on May 1,1964 for the Big Rock Point Plant are requested:
I.
Changes A.
Incorporate the attached Section 3.1.5 B.
Insert the attached " Tables 3 5.2.h and h.5.2.h."
II.
Discussion 1
Following analysis of the Big Rock Point Plant to demonstrate conform-ance with the Interim Acceptance Criteria, it was recognized that modi-fications to existing plant systems were required. Several modifications were evaluated and the installation of a reactor depressurization system was selected as the most desirable course of action. A detailed descrip-tion of this modification was submitted August 15, 1974 This report was titled, " Big Rock Point Plant Reactor Depressurization System Description, Operation and Performance Analysis." Thic report provides the basis of this Technical Specifications change.
III. Conclusion Following review of the proposed Technical Specifications for the reactor depressurization system, the SARB has concluded that these specifications are appropriate to govern operations of the RDS and will not result in a significant increased risk to the public health and safety.
CONSUMERS POWER C0!PANY fl
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J By k! A lc. i R. A. Lamley, Vice Prdsident Sworn and subscribed to before me this 10th day of March 1975 4
t Sylvia B. Ball, Notary Public f
Jackson County, Michigan My commission expires May 18, 1976.
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