ML20024G563
| ML20024G563 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 09/17/1974 |
| From: | Goller K Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102120669 | |
| Download: ML20024G563 (3) | |
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_ Dis t ribut ion Docket File g.s 4.I AEC PDR Local PDR SEP 17 Docket No. 50-263 g - @I TJCarter aShea orb #2 Reading RMDi,tgs OCC Northern States Power Cogany Ayth Mr. L. O. Mayer, Director of R0 (3)
Nucisar S qport Services ACRS (16) 414 dicollet Hall Minneapolis, Minnesota 55401 Centlassas By letter (1) dated January 23, 1974, you submitted descriptive and analytical information related to a proposed plant modification, a new concept identified as a Prompt Relief Trip (PRT) systes,,
in effect, the proposed PRT system anticipates pressure increases resulting from
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a turbine or generator trip and promptly opens reaief valves before the
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pressure increases to tne overpressure set point '.1080 psig + 1%) that
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causes the safety / relief valves to open in time f.o prevent excessive
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core coolant pressure.
The resultant pressure taansients are smaller l
because the safety / relief valves open earlier.
A limited approval (2) to proceed with the installation of selected portions of the proposed PRT system during the 1974 Spring refueling outage was granted after e
0 meeting with NSF representatives on February 20 and 21,1974 the proposal.
It was anticipated (2) t to review posal including the analytical methods g our evaluation of the pro-(
l September 1974.
i would be cowleted by However, we have not received responses to the various S
requests we ve made for additional information related to system j
reliability (4 and analytical methods. You later(5) submitted additional a
b (1)
USP submittal " Permanent Plant Chsnges to Accosmodate Equilibrium
,1 Core Scram Basetivity Insertion Characteristica".
i (2) Directorate of Licensing letter to NSP dated March 14, 1974 - includes
,C minutes of February 20-21, 1974 meeting with NSP representatives and a safety evaluation.
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t (3)
Analytical Hethods of Plant Transient Evaluations for the General Electric Boiling Water Reactors (Raf. HEDo-10802 February 1973).
L (4)
Directorate of Licensing letter to NSF dated April 4,1974 requestes additional information in six different areas by April 30, 1974.
l (5) l NSP submittal dated April 10, 1974 listed technical specification
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and noted tha t the FRT system was met reguired until L depletion ~is Mehleved~duriss~eyela~ 3 " operation 7 ~ 200 MWD fuel i
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information to allow reactor operation for a 11a;1ted period of t1 during fuel cycle 3 without the PRI system. Additional questions )
l of a generic nature were forwarded to General Liectric by the i
Directog le of Licensin; and our progress in evals.ating the analytical i
j methods %g> maaJg the PEI yreposal were discussed by talephone and r
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during
$ngs with General Liectric retrosentatives. Only partial i
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responses te aar coricerna have been received. By letter dated j
June 25. Iv74, we rejected certalu PRT penal wiring and testing features.
ne peap's rf this letter is to inform you that since we have been i
j unable te resolve oor concerne related to the PRT system and analysis we cannot conplate our evaluatiem W hAn the time frame originally 1
l st.# ted (Septandier 1974) and we cam.a.4 :.,otinue our evaluation until you j
have provided the requested infom%on.
.a Sincerely, I
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i OrfrIntir r.,M Ly:
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Karl R. Goller, Assistant Director i
k for Operating keactors I
Directorate of Licensing l
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W) Directorate of Licensing letter (V. A. } bore) to General Electric Company (L A. Hinds) dated April 22, 1974 requested generic infornia-4 i
i tim by Hay 1,1974.
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1 (7) Himutas of Meeting with General Liectric representatives on May 15-16, l
1974 to review PItr analytical methoda (by 14o Beltracchi - dated v
June 20,1974). Statue of ALC review included as enclosure 1.
(Sa) NSP Ictter dated April 26, 1974 promises responses to Directorate of l
Licensing's April 4,1974 request for additional info and reviews l
t status of modification progress during the outage.
l (8b) MSF letter dated April 26, 1974 discusses dynamic analysis tweite
,f ::afsty/ Relief walve operatipo, i
f (Sc) MSP Gdimittal dated May 13, 1974 responds to April 4,1974 Directorate of Lieansing letter.
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Vice Presidesit - Law lavironmental Library of Northern Statee Power Corgany Minnesota 414 dicollet Hall 1222 S. E. 4th Street Minneapolis, Minnesota 55401.,
Minneapolis, Minnesota 55414 Gerald Charnoff Ken Dzugan, Director Shaw, Pittman, Potte, Trowbridge City of St. Paul Pollution and Madden Control Services 910 - 17th Street, N. W.
100 East 30th Street Washington, D. C.
20006 St. Paul, Minnesota 55108 l
110 ward J. Vogel, Lsquire i
Legal Counsel j
2750 Dean Parkway Minneapolis, Minnesota 55416 Steve Gadler, P. E.
2120 Carter Avenue St. Paul, Minnesota $5108 Mr. Daniel L. Ticker Assistant City Attorney j
638 City Hall St. Paul, Minnesota 55102
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Sandra S. Cardebring Special Assistant Attorney General Counsel for kinnesota Pollution Control Agency 1935 W. County Road 32 Roseville, Minnesota 55113 Anthnay %. Roisman, Esquire Berlin, Roissan and 14seler 1712 H S t ree t, N. W.
Washington, b. C.
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