ML19323C856

Submits Questions & Definitions Supplementing Re NRC Testimony on Issues of Low Head Injection Sys & Util Compliance History

ML19323C856
Person / Time
Site:	Beaver Valley
Issue date:	05/13/1980
From:	Levin J PENNSYLVANIA, COMMONWEALTH OF
To:	Russell W Office of Nuclear Reactor Regulation
References
NUDOCS 8005190314
Download: ML19323C856 (3)

Text

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80051903D N

COM MONWEALTH O F PE"NNCYLVANIA PENNSYLVANIA PUBLIC UTILITY COMMISSION P. O. BOX 3265. HARRISBURG. PA.17120 May 13, 1980 gN ESPLY #bEASE agFEW 70 OUA PlbE William T. Russell Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, DC 20555 Re: NRC Staff testimony

Dear Bill:

This letter supplements that of May 5, 1980 and cevers the two remaining issues we have discussed: problems with the low head safety injection system and Duquesne's NRC compliance history. A copy of this letter will be forwarded to you by telefax.

Additional definitions and questions -- turbine spindle cracking

- stators

- outer disks

- "intergranular" stress corrosion cracking

1) Describe the turbine cracking observed at Yankee-Row on February 15, 1980.

2) Describe the turbine cracking at Shippingport in 1974.

3) Describe the allegations made by anonymous letter referred to by J.P. Knight in a memorandum to S.A. Vargu on January 16, 1980, and the NRC response.

Definitions - low head safety injection system

- ECCS (Emergency core coolin ; system) e

- NPSH (Net positive suction head)

- RS (Recirculation spray)

- NPSH (Net positive suction head)

- LOCA (Loss of coolant accident)

- pressure flash D

- sumo water vapor pressure

. - cold water injection

- pump cavitation

1) What function does the low head safety injection system play during a loss of coolant accident?

2) How does the Stone and Webster LHSI design operate?

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3) What factors peculiar to the Stone and Webster design result in pump cavitation during a LOCA?

4) Why is pump cavitation undesirable, what causes it and what i

prevents it?

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5) What fixes are available to cure the LHSI cavitation problem?

6) Which has Duquesne - S/W selected?

7) What remains to be completed at Beaver Valley with regard to the LHSI problem? When will it be completed?

8) Describe " critical paths" analysis.

Is the LHSI problem on the Beaver Valle.y I restart critical path?

9) Describe the LHSI pump shaft alignment problems experienced at Beaver Valley Definitions - Regulatory functions and compliance

- NRC - Office of Nuclear Reactor Regulation

- Quality assurance

- " Defense in Depth"

- NRC inspection functions

- Office of Inspection and Enforcement

- Responsibility of licensee for design and testing

- selective inspections

- Licensee reporting requirements'(LERs, etc.)

- deficiencies, infractions, violations

- abnormal events, reportable occurences, unusual events

1) What is Beaver Valley's inspection history?

2) What is Beaver Valley's enforcement history?

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3) Based upon national experience, what is Beaver Valley's availability record?

Again, if there are additional definitions or questions.you believe ought to be included, please let me know.

I plan to meet with each witness on May 20 at a minimum, and may request telephone conferences before that date, 4

time permitting.

f Very truly yours, l

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John A. Levin

-Assistant Counsel 4

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