ML19322D928
| ML19322D928 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/13/1980 |
| From: | Haverkamp D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Creswell J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML19322D920 | List: |
| References | |
| NUDOCS 8003110226 | |
| Download: ML19322D928 (3) | |
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What folicwup work was done with respect to each of these events?
Include a description of any analysis that was perfnnned and your conclusions regarding the severity of the event.
t Followup work performd by Region I with respect to each of the ECCS actuations at TMI-2 is described in inspection reports as indicated in the below table.
FCCS Actuation Licensee NRC Region i Date Repo.r_t_s,
,1,nspe.ctio,n Rep.o_r,ts 3/29/78 Met Ed letter GQL 0698 dated 5/1/78 48-15 Para 4
/w/LER 78-21/3L 78-17, Para 4 and 5 Het Ed letter GQL 1118 dated 6/27/78 8-24. Para 10 nuss q w/Special Report (Designated by neston 2 an Len 7&-Cf(00)()
4/23/78 Met Ed letter GQL 1227 dated 7/24/78
/78-17, Para 8
,% q ;, m w/Special Report (Designated by 78-24, Para 3, 6, 7 0
Region.I as LER 7R-32/9.9V) and 10
.y fet Ed letter GQL 0871 dated 5/8/78 78-27, Para 2 and 3 w/1.ERs 78-33/iT and 78-34/1T fiet Ed letter GQL 1186 dated 7/31/78
- 78-28, Para 2, 5
/w/ Revision !l to LERs 78-33/lT and 6 and 78-34/1T 11/7/78 flet Ed letter GQL 0114 dated 1/30/79
0-33. Para 4 w/LER 78-65/99X
,79-07, Para 6 12/2/78 j Met Ed letter GQL 0286 dated 2/28/79 79-07, Para 6 w/LCR 78-69/99X No additional or special analysis was considered necessary for performance by either the li'censee or Region 1 as a result of the above ECcs including the causc(s), [ consequences and determinatinr:
actuations.
However, an ' engineering evaluation of each actuation,.
of appropriate corrective action (s), was performd by the licensee and reviewed by NRC Region i inspectors and supervisory personnel.
In addition, details of the licensee's evaluations of the March 29 and April 23, 1978 events were infonnally provided by the Region I project inspector to the NRR project nanager for his independent review.
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2 No quantitative assesscent of the severity of each event was performed by the NRC. The ECCS actuations of March 79, 1978 and April P3, 1978 were considered severe due to the magnitude and extent of the accompanying transients, whereas the actuations of November 7,1978 and December 2, 1978 were of short duration and thus less severe.
Ilowever, cach ECCS actuation was significant in that they were all valid initiations.
With regard specifically to the U$5 of HPI at THI-2, whether you 4.
contecplated any actions that would reduce the number of actuations of HPI under non-loss-of-coolant accident condit. ions.
The TNT-2 ECCS actuations resulted from ei ther an actual loss-of-coolant condition (March 29, 1978), an overcooling condition (April 23, 1978 and December 2,1978), or an underpressure condition (November 7, 1978). For each non-loss-of-coolant accident condition, the ECCS actuation was necessary to maintain or restore subcodintJ of the reactor coolant system.
The cause of each actuation was unique, as was the appropriate corrective action to prevent recurrence of the transiesits.
The licensee's corrective actions were reviewed and found acceptable.
No additional actions were contemplated by the fRC that would reduce the ntnber of HPI actuations.
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Reference 26 MAY 3 1978 1
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HDGAMEUM FOR:
E. J. Brunnar, Chief. Reactor Operations and Nuclear Support Branch, Region I FRON:
K. V. Seyfrit, Assistant Director' for Technical Programs. IE-
SUBJECT:
THREE MILE ISI.AND UNIT NO. 2/ PRESSURIZER Ra.IEF YALYE(AITSF14674H2)
By memorandua dated March 31, 1978, t'he Region requested that we review the adequacy of the control system for the subject valva.
The request is based on failure of the valve in the open position.
Failure in this position is covered in Section 7.4.1.1.6 of the FSAR.
We conclude that additional review is not warranted.
Action Itera F14674H2 is closed.
i i
Karl V. Seyfrit. Assistant Direc!.pr for Technical Programs Division of Reactor Operations Inspection cc:
E. C. McCabe, RI D. M. Sternberg, RI DISTRIBUTION O. R. thverkamp. RI Docket Files (2)
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