ML20085F456

AO AO-4-75:on 750307,util Determined Certain Seismic Class I Piping Sys Restraints Do Not Comply W/Fsar Design Criteria. Investigation Into Cause Underway.Sys Studied Listed

ML20085F456
Person / Time
Site:	Palisades
Issue date:	03/17/1975
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML20085F445	List: ML20085F436 ML20085F447 ML20085F451 ML20085F456
References
AO-4-75, NUDOCS 8308220113
Download: ML20085F456 (2)

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L Regsdo:y Cx%et File ABNORMAL OCCURRENCE REPORT Docket 50-255 f fd '

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1. Report No: A0-h-75 2a. Report Date: March 17, 1975 I

2b. Occurrence Date: March 7, 1975 3 Facility: Palisades Plant, Covert, Michigan I

h. Identification of Occurrence: From a continuing study that was q initiated during the summer of 1974, it has been determined that =

certain seismic Class I piping system restraints installed in the ,

original construction of the plant or subsequently modified do not comply with design criteria contained in the FSAR.

5 ConditJons Prior to Occurrence: Plant in cold shutdown.

6. Description of Occurrence: A review of the seismic restraints has f determined that not all the restraints on the Engineered Safeguards systems and connections to the primary coolant loops (safety-related '

- and shutdown cooling systems) were in conformance with the design

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. criteria. Preliminary information on this occurrence was obtained  ?

on March 7, 1975 7 Designation of Apparent Cause of Occurrence: Difference between design requirements and currently existing restraints on these seismic Class I piping systems as originally installed or as subsequently modi-fied are being studied. This information vill be available at a later date.

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8. Analysis of Occurrence: As of March 14, it has been determined that approximately 135 new restraints and restraints to replace those that  ;

, may have been removed will be required. In addition, approximately.10 modifications to existing restraints are required. 4 The systems (complete or portions of) studied rre as follows:

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a. High- and low-pressure safety injection systems both inside and l outside containment. ,

b. Critical service water system both inside and outside containment.

c. Component cooling water outside containment.

d. Charging system.

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e. Concentrated boric acid system. -

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f. Air room purge and containment air purge outside containment.  !;

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g. Containment spray.

h. CVCS 5etdown system through flow control valves.

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1. Fuel oil to the emergency diesels.

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j. Connections to the primary loop through the block valves. {

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k. Critical service water branch connections that are isolatable. .

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1. Auxiliary feed-water system. r tv j

m. Main steam to auxiliary feed-water pumps. r,

m. Gas decay tank connections. l f-

o. Diesel generator auxiliary systems. f

p. High-pressure air to the safeguard valves.

q. Steam generator blowdown.

9 Corrective Action: Each of the safety-related and shutdown cooling systems will be reviewed and all new restraints and replacement of removed restraints and modifications to existing restraints that are ,

required will be identified about March 19, 1975 Restraints on seismic H Class I systems will be corrected prior to reactor operation above a level consistent with requirements for turbine balancing.

[ l Detail drawings are being prepared, meterial is being procured, and construction operations initiated. Upon completion of construction operations, these systems will be in full compliance with the design criteria contained in the FSAR.

10. Failure Data: N/A.

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