ML20063A258
| ML20063A258 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 08/17/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 17578, NUDOCS 8208240268 | |
| Download: ML20063A258 (5) | |
Text
@ Consumers Power C0mpBnY
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and Construction General offices: 1945 West Parnali Road, Jackson, MI 49201 e (517) 788-0453 August 17, 1982 82-07 #2 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND PROJECT -
DOCKET NOS 50-329 AND 50-330 Q-RELATED EQUIPMENT COOLED BY NON-Q HVAC SYSTEM FILE:
0.4.9.63 SERIAL:
17578
Reference:
J W Cook letter to J G Keppler, dated June 25, 1982, same subject, Serial 17529 This letter, as was the referenced letter, is an interim 50.55(e) report on Q-related equipment cooled by non-Q HVAC system.
Another report, either interim or final, will be sent on or before November 22, 1982.
WRB/j ac
Attachment:
MCAR-59, Interim Report 2, dated August 2, 1982 CC: Document Control Desk, NRC Washington, DC RJCook, NRC Resident Inspector Midland Nuclear Plant AUG101sp OC0882-0025A-MP01 h
8208240 Ate % 3
2 Serial 17578 82-07 #2 CC: CBechhoefer, ASLB Panel RSDecker, ASLB Panel FPCowan, ASLB Panel JHarbour ASLB Panel AS&L Appeal Panel MMCherry, Esq MSinclair BStamiris CRStephens, USNRC WDPaton, Esq, USNRC FJKelley, Esq, Attorney General SilFreeman, Esq, Asst Attorney General WRMarshall GJMerritt, Esq. TNK&J OC0882-0025A-MP01
Bechtel Associates Professional Corporation B115C
SUBJECT:
HCAR 59 (issued May 28, 1982)
INTERIM REPORT 2 DATE:
August 2,1982 4
PROJECT:
Consumers Power Company Midland Plant Units 1 and 2 Bechtel Job 7220 Description of Deficiency Safety-related devices are located in portions of the auxiliary building (AB) which are cooled by non-Q HVAC systems. Loss of these non-Q HVAC sys-tems following various design basis accidents could result in room environ-mental temperatures which could exceed the specified design temperature of
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104F since the rooms are serviced by non-Q HVAC systems.
Summary of Investigation and Historical Background The preliminary results of the review of the project design drawings iden-tified 94 areas containing approximately 1,500 items of Class lE electrical h
equipment, devices, and instruments in the auxiliary building (AB) which are cooled by non-Q HVAC systems.
t Analysis of Safety Implication The preliminary predicted maximum environmental room temperature in the non-Q cooled portions of the AB, assuming a design basis accident simul-taneous with an extended loss of the non-Q HVAC systems, exceeded 120F.
l j bg Under these conditions, the safety related equipment in these rooms may not operate reliably and in many instances, both trains of redundant Q equip-ment are affected by the loss of the non-Q HVAC system. Calculations for heat gain from the reactor buildings and from hot piping of ESF systems j
are being revised to more accurately reflect the post accident conditions which should result in lower room temperatures.
i Probable Cause The root cause of these discrepancies is still under investigation. Pre-liminary indications are that recent equipment additions provided to conform to N.R.C. recommendations resulting from the lessons learned at Three Mile Island Unit 2 and the normal design evolution, development, and physical implementation process has necessitated certain system I
changes, equipment additions, and physical relocations.
While on project requirements and documentation existed identifying the ventilation systems design capability and requirements for Class 1E and seismic components, proper correlation of requirements in the design coordination process did not always occur, allowing the subject condition to develop.
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c81150 Bechtel Associates Professional Corporation MCAR 59 Interim Report 2 August 2, 1982 Page 2 Corrective Action 1.
Project engineering is still in the process of reviewing the safety function of the Q devices in the areas already identified to eval-unte the safety-rclated implications'of the equipments' failure following the design basis accidents.
Should the evaluation indi-cate that failure of the equipment could adversely affect the capa-bility of the plant systems to mitigate the consequences of the accident or achieve and maintain a safe shutdown, corrective action would be implemented on a case-by-case basis. These actions could include the following:
a)
Upgrade selected AB HVAC systems to Q status to limit the effect of the peak room temperature within the current environ-mental qualification envelope of the equipment.
b)
Relocate the Class lE device to another area where the pre-dicted peak environmental temperature is within the environ-mental qualification envelope of the equipment.
c)
Replace the Class lE device, which does not qualify for the predicted peak room temperature, with one that qualifies.
d)
Qualify the existing Class 1E device for temperatures greater than or equal to the calculated peak room environmental tem-erature.
Specific area by area resolutions will be addressed in future k
interim reports.
2.
Project Drawings 7220-M-560(Q), Sheets 1 through 9 Rev 0, were issued on July 26, 1982, which clarify the areas of the AB which are cooled by Q HVAC systems. The use of these drawings should result in locating Q devices only in areas where Q HVAC exists. -
3.
Efforts are currently underway to evaluate the feasibility of in-creasing the capacity of the existing safeguards water chillers so as to be able to add Q cooling in certain areas of the AB as re-quired.
4.
A preliminary assessment has been made of 60 of the 94 affected areas. Eighteen of these areas' appear to require Q cooling.
Pre-liminary estimates of equipment sizes have been made and efforts have begun to reserve space in the 18 areas for potential new HVAC equipment.
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Bechtel Associates Professional Corporation MCAR 59 08ll5Q Interim Report No. 2 Date: August 2,1982 Page 3 Reportability This deficiency was reported to the NRC on May 26, 1982, as potentially reportable under 10 CFR 50.55(e) by W.R. Bird of Consumers Power Company.
Submitted by:
T.G. Ballweg V Mechanical Group Supervisor Approved by E.M. Hughes Q
Project Engineer Concurrence by:
M.T. Fravel A
Chief Mechanical Engineer
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v Concurrence by: [. /
, s wM.s E.H. Smith Engineering Manager
,b Concurrence M.A. Dietrich Project Quality Assurance Engineer l
Note:
Denotes information which has been revised or which is new since the last interim report.
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