ML19320C686
| ML19320C686 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/09/1980 |
| From: | Jay Collins, Conte R, Shanbaky M Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| PNO-TMI-80-038G, PNO-TMI-80-38G, NUDOCS 8007170564 | |
| Download: ML19320C686 (1) | |
Text
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P LIMINARY NOTIFICAT10N OF EVENT OR UNUSUAL CONCURRENCE-C'iG ~NI K-2M Nis :eit hinarv notif} cation constitute. 5AF.LY n.tice of ments cr ?05M5u. sa fety cr
,3,,, tic i " arost significance.
The 'inToAadion Dresented 14 as init.ip),h,;epMvac dtIiout verifica:1cn or evaluation ano is tasically a1i :nat is known by tGC staf t an this date.
acili5m.%tmpeiitan Edison Company Three Hile Island, Unit 2 Middletown, Pennsvivania Decket Number. 50'-320
Subject:
REACTGR BUILDING PUP.GE STATUS Purging of tha' reactor building atmosphere utilizing the nodified hydrogen control (WC) system continued at various system flow rates based on meteorological condition.
"=:ntary snutdowns alsa occurred due to stack monitor filter chanceouts.
Yes te rday 's system shutdown on high alarm of the purge system monitor (HP-R-229) noble gas channel was due to a faulty detector cable.
The detector and cable were replaced and the ncnitor was restored to operation.
In additico, based on aeteorological conditions, it was decided Lu utilize the modified reacter building purge system (MPS) for e fester purge rate.
Maximum purt;e systen flow rate was approximately 4,000 cim. wnile stack flow rate averaged :pproximatuly 105,000 cfm in the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Total calculated radioactivity released as cf 10:00 a.m. was 33,735 Ci based on stack flow rate and r.easured stack concentratien.
- emining cencentration in the -cactor b. ilding based on the last buildin: nrcle w ar:!y:ac at 0.13 uCi/cc (7,645 Ci, *ml:.
Este effluent monitors continue to i-dicate no particulata sc+.ivity be-; M::::.
Curing the operation of the fast purge system leaks were detected in the system resulting in local noble gas concentration (approximately 100 MPC) near the ventilation system in the auxiliary building. The majority of these leaks were corrected. Current concentration was de* ermined to be 8-10 MPC.
Further identification of additional lecks is in progress.
All gaseous leakage was mnitored pri,or to release.
Additional reports on reactor building purging will be updated on a daily basis during the initial stages of purging.
The.'iRC Region I mobile laboratory will continue to be used to verify the licensee's analytical results.
Media interest has occurrad because of public sensitivity to this evolution and TMI related events. The Commonwealth of Pennsylvania has monitored these events. tEC has responded to Hquiries. The NRC TMI Program Office staff has mnitored events as they occur on a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> basis.
This infort.1ation is curr it as of 11:00 a.m.
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