ML20052E682
| ML20052E682 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/04/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 16904, NUDOCS 8205110343 | |
| Download: ML20052E682 (3) | |
Text
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@ C0hSum8TS Power e
i James W Cook h hhf Vice President - Projects, Engineering and Construction General offices: 1945 West Parnell Road, Jackson, MI 49201 e (517) 78&O453 May 4, 1982 m
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Harold R Denton, Director jf'/
O Office of Nuclear Reactor Regulation d
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.C US Nuclear Regulatory Commission
- V4 Washington, DC 20555
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si MIDLAND PROJECT
- I' MIDLAND DOCKET NOS 50-329, 50-330 SAFETY EVALUATION REPORT INFORMATION FILE: 0505.16 SERIAL:
16904
Enclosure:
Challenge to Safety Valves Caused by Steam Generator Overfill Protection System The enclosure provides information requested by the NRC Staff to facilitate their review of the Midland FSAR with respect to generating the Safety Evaluation Report. This information will close out the outstanding item involved.
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JWC/JRW/fms CC RJCook, Midland Resident Inspector 0/
Rllernan, US NRC 0
DBMiller, Midland Construction (3) g RWiluston, Washington I
I 8205110343 820504 PDR ADOCK 05000329 E
PDR oc0482-0924a131
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CHALLENGE TO SAFETY VALVES. CAUSED BY STEAM GENERATOR OVERFILL PROTECTION SYSTEM i
Item Demonstrate that the reactor system safety valves will not be challenged following main feedwater isolation valve closure by the steam generator overfill protection system.
Response
B&W performed an analysis of excessive feedwater to both steam generators at full power.~ :The analysis utilized a digital plant simulation available at the Lynchburg Research Center. The reactor tripped on high pressure but operation of the PORV at 2260 psig (setpoint) prevented a challenge to the safety valves. The reactor coolant pressure had decreased to approximately 2050 psig prior to feedwater isolation. Taking uncertainties into account, the margin 4
to the safety valve setpoint was between 20 and 70 psi. Excessive feedwater and loss of feedwater are bounded by the safety analyses presented in the Midland FSAR.
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oc0482-0924bl31
CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329, 50-330 Letter Serial 16904 Dated May 4, 1982 At the request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy Reorganization Act of 1974, as amended and the Commission's Rules and Regulations thereunder, Consumers Power Company submits the enclosure to CP Co letter Serial 16904 dated May 4, 1982 entitled, Challenge to Safety Valves Caused by Steam Generator Overfill Protection System.
CONSUMERS POWER COMPANY By J W Cogn, Vice President Projects, [ngineering and Construction Sworn and subscribed before me this k day of May, 1982 b - L -- >
Notary Public l#
Jackson County, Michigan My Commission Expires Sentomber 8. 1984 oc0482-0924b131