ML20058K775
| ML20058K775 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 05/20/1974 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| NUDOCS 9102140381 | |
| Download: ML20058K775 (1) | |
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-Manticello, Minns ata 55362 2.
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'My 20,1974
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'Mr. J. G. Kappler, Regional Director
,; i Directorate of Regulatary. Operations Region III 799 P.cosevelt Pmad Glen Ellyn, Illirmi*
61073
Dear Mr. Keppler:
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-N N GENERATINt3 PIMF l
-Ibckst'No. 50-263 License No. 5 1-22 l
--During startup an May 20, 1974, while operating at 575 psig reactor pressure and conducting cn-line resting of ths : :xiified off gas holdun system, a hydrceen detonation occurred resulting in b1c.iing out both air ejector discharge line i
rupture discs and releasing off gas irca the reactor building vent. The mir" release rate was 6200 uci/sec for five minutes, then decreasing to less th:In
-100 uci/sec after 21/2. hours. 'At.no time was the technical specificaticn relcas l Limit of 210,000 uci/sec ow.-wW h cause-of the lydrogen detonation is under investigatien.
"Yours very t i
- C. E.
Plant 15anager
- GI/nmut cc:.J F'O'Imary, Directorate of Licensing
-.G Charnoff i
" Minnesota Pollution Control Agency
.Atta: E N Pryrdna l
. Pile Copies sent by teleccoier to Keenler and O'Icary e
'9102140381 740520 i
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