ML20090L683
| ML20090L683 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 01/14/1976 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9102120530 | |
| Download: ML20090L683 (3) | |
Text
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t NSRm NORTHERN 5TATES POWKR COMPANY M I N N E A PO LI S. M I'd dESOTA 98404
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Q N k,,-((j(,I Mr Victor Stelle, Director y
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Division of Ope:ating Reactors b
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U S Nuclear Rr.gulatory Commission
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Dear Mr Stello:
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\\p MONTICELLO NUCLEAR GENERATING PIMf
,/ M Docket No. 50-263 License No. DPR-22 Annual Report of Primary Coolant Lenkage to Drywell This report is submitted in accordance with Section 6.7.C of Appendix A, Technical Specifications, of the Provisional Operating License for the Monticello Nuclear Generating Plant.
It is a sunnary of coolant leakage to the drywell measurements for the period of January 1 through Decenber 31, 1975.
Drywell Icakage is broadly classified as being from identified or unidentified Identified Icakage is piped from the recirculation pump seals, various s ou r c e s.
valve sten leak-offs, the reactor vessel flange leak-off, bulkhead drains, and l
vent cooler drains to the drywell closed radwaste sump. All other leakage is j
collected in the drywell open radwaste sump and classified as unidantified Icakage.
Drywell leakage is calculated daf.ly using flow integrators installed in the pump i
discharge lit.e of each sump. Accuracy of measurement is better than 137..
Drywell leakage is also continuously monitored by detecting changes in open and closed dry-well radwaste sump icyc1 sensed by special icvel transmitters installed for that pu rpose. Sensitivity of this system to coolant Icakage changes is better than 0.4 GPM with a response time of one minute.
Table I is a sunnary of drywell coolant Icakage t.casurements for 1975. As noted in the Table, all leakage remained well below the Technical Specification Limits of 5 GPM for unidentified leakage and 25 GPM for total leakage, l
l Yours very truly, W 8.8v L 0 Mayer, PE Manager of Nuclear Support Services IDM/DMM/ak 9102120530 760114 PDR ADOCK 05000263 cc: J G Keppler R
PDR 8
G Charnoff dM Minnesota Pollution Control Agency Attn: J W retuan Attachment
Table I Summary of Coolant Leaknge to Drywell during Power Operation - 1975 Leakage from Known Sources (GPM)
Leakage from Unknown Sources (GPM)
Total Irakage (GPM)
Month Highest Lewest Avg Highest Iowest Avg Highest Lowest Avg Remarks Jan 1.37 1.16 1.23 0.21 0.0 0.05 1.58 1.16 1.28 Shut down Jan 10 th ough Feb 6 Feb A.70 0.60 1.23 0.23 0.0 0.05 1.70 0.60 1.28 Mar 1.34 1.03 1.24 0.31 0.0 0.07 1.61 1.03 1.31 lApr 1.37 1.19 1.23 0.25 0.0 0.07 1.55 1.19 1.30 May 1.38 1.06 1.22 0.38 0.0 0.20 1.65 1.20 1.42 Shut down May 16-17 iJun 1.38 1.15 1.24 0.27 0.0 0.09 1.55 1.17 1.33 Jul 1.88 1.07 1.26 0.27 0.0 0.07 1.88 1.07 1.33
- Aug 1.88 1.04 1.21 0.31 0.0 0.11 1.88 1.04 1.32
'Sep 2.22 1.04 1.25 0.42 0.0 0.24 2.64 1.19 1.49 shut down Sept 12 through Oct Nov 18 Nov 1.49 1.17 1.29 0.12 0.0 0.08 1.60 1.17 1.37 Dec 1.85 1.35 1.64 0.19 0.0 0.09 1.96 1.50 1.73 l
l l
Year 2.22 0.60 1.28 0.42 0.0 0.10 2.64 0.60 1.38 (8.4*)
(2.0*)
(10.6*)
(5.5*)
l l
- Percentage of Technical Specification Limit I
MmEMM
NRC DISTRIBUTION TOR PART 50 DOCKET MATERI AL
' (TEMPOR ARY F ORM)
CONTROL NO:
4 c2 3 FILE:
i Q4cy. Northern States Pwr Co DATE OF DOC DATE REC'D LTR TWX RPT OTHER Minneapolis, MN tppgg 1 14-76 1-10-7b XXX TO:
ORIG CC OTHER SEN T NRC PDR _.
XX Hr Etello one signed SENT LOCAL PDR
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CLASS UNCLASS PROPINFO INPUT NO CYS REC'O DOCKET NO:
1 50-263 XXXX DESCRIPTION:
ENCLOSURES:
Ltr trans the foll& wing:
Annual Report of Primary Coolant Leakage to Drywell.....per requirements of Tech Specs
....(40 cy6 enc 1 rec'd)
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