ML18059B127
| ML18059B127 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 07/22/1994 |
| From: | Rogers D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9408020207 | |
| Download: ML18059B127 (3) | |
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consumers Power POW ERi Nii
/llllCHlliAN'S PROliRESS Palisades Nuclear Plant:
27780 Blue Star Memorial Highway, Covert, Ml 49043 July 22, 1994 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 David W. Rogers Plant Safety and Licensing Director*
DOCKET 50-255 - LICENSE DPR PALISADES PLANT - UPDATE ON COMMITMENT FOR AUTOMATICALLY SWITCHING THE CONTROL ROOM VENTILATION TO THE EMERGENCY MODE OF OPERATION Licensee Event Repo.rt {LER)88-013 was submitted on September 22, 1988 and describ~d the failure of the control room ventilation system to maintain a positive pressure as a measure of protection against unfiltered air in-leakage to the control room area.
As a result of the investigation completed to review this event, vestibules were installed for two of the four control room doors and revised control room habitability analyses were performed.
In November of 1988, radiation detection instrumentation was installed in the control room heating ventilation and air conditioning (HVAC) envelope to provide for detection of airborne activity.
An Operations D~partment Standing Order directed the operators, upon receipt of a radiation detection alarm, to place the control room HVAC in the emergency mode.
This information was reported i.n Supplement 1 to LER 88-013 dated November 17, 1988.
Reviews were then completed to determine if a modification would be feasible to permanently in$tall process radiation monitors in the normal control room HVAC intake for early radiation protection to provide margin with respect to control room ope.rater dose 1 imits.
The results of these reviews showed that these pa.rti.cular -mod-ifications would.not be feas.ible, but. that additional.
evaluations would be conducted to determine if other cost beneficial engineering optioris were available. This information was reported in Supplement 2 to LER 88~013 dated-March 31, 1989.
Supplement 3 to LER 88-013, dated August 31, 1989, provided the final results of the evaluations based on the desirability of having the control room HVAC system automatically switched into the emergency mode upon detection of 9408020207.940722 PDR ADOCK*05000255 p
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A CMS ENERGY COMPANY
2 airborne activity by existing plant radiation detection instrumentation.
As a result of the evaluation, plans were to provide for the automatic switch-over of the control room HVAC system into the emergency mode from detection of radiation by the* radioactive gaseous effluent monitoring system and the main steam line gamma monitor.
Plans were to have the standing order remain in-place for switching of the control room HVAC to the emergency mode upon alarm of the radiation detection equipment placed in the control room envelope until the time that the automatic switch-over modifications could be made.
- Currently* the radiation monitoring equipment installed in.the control room envelope remains operational and the standing order actions are still in place to direct Operations to switch to the control room HVAC to the emergency mode upon radiation detection~ However, the modifications were never completed to provide for the automatic switch-over of the control room HVAC system into-the emergency mode from detecti.on of radiation by the. radioactive gaseous effluent monitori~g system and the main steam line monitor.
Our *reviews have determined that the commitment to complet~ this modification was closed Ollt to a follow-up corrective action mechanism during one of th.e early evolutions of our commitment tracking system, such that the commitment tracking system showed that this item was closed.
The project to allow the in plant. radiation detection equipment tQ switch the control room HVAC-to the emergency mode was later canceled without recognition that the work was tied to an NRC commitment which also needed to be reconciled if the project was not completed.
The pu~pose of this letter is to inform the NRC that althoug~ no completion date was* given for COJTipletion of the modification, the modific~tions stated in Supplement 3 to LER 88-013 for automatic switch-over of the control room HVAC have not been completed.
The plant system engineering department h*s initiated a re-review to re-establish the need for the modification based on today's control room. habitability situation. The results of these reviews by system engineering will' be reported to the NRC when they are completed.
Until then, fadiation detection instrumentation will remain installed in the control room envelope and standing order.actions require operators to switch the control room HVAC to the emergency mode upon radiation detection.
We are in the proces~ of reviewing all of the open commitments we have made to revi.ew q_ur completi.on schedule and status. If we determine that the
-comp le ti.on sch*edules for any. of these-commitment~ needs to be changed we w.il l notify the NRC of the revised completion schedules. _
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3 We are also reviewing a sampling of all commitments beginning with January 1, 1986 through December 31, 1989, to assure that the commitments have been adequately closed and documented.
This time interval was chosen for review because in 1986 a programmatic review of previous commitments was completed in conjunction with our response to the NRC's May 21, 1986 confirmatory action letter. Also, beginning in January of 1990 we implemented a new commitment tracking system which is more focused on the closeout documentation of commitments.
David W Rogers Plant Safety and Licensing Director CC~ Administrator Region III, USNRC Resident Inspector, Palisades