05000348/LER-1979-021-01, /01T-3 on 790412:statistical Sampling of Seismic Category I Anchor Bolts Would Not Provide Probability Greater than 95% Reliability.Caused Under Investigation. Testing Extended to 100% Verification of Anchors on Pipe

/01T-3 on 790412:statistical Sampling of Seismic Category I Anchor Bolts Would Not Provide Probability Greater than 95% Reliability.Caused Under Investigation. Testing Extended to 100% Verification of Anchors on Pipe

ML19270H210
Person / Time
Site:	Farley
Issue date:	06/19/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19270H209	List: 05000348/LER-1979-021, Forwards LER 79-021/01T-3 05000348/LER-1979-021-01, /01T-3 on 790412:statistical Sampling of Seismic Category I Anchor Bolts Would Not Provide Probability Greater than 95% Reliability.Caused Under Investigation. Testing Extended to 100% Verification of Anchors on Pipe
References
LER-79-021-01T, LER-79-21-1T, NUDOCS 7906250252
Download: ML19270H210 (4)

LER-1979-021, /01T-3 on 790412:statistical Sampling of Seismic Category I Anchor Bolts Would Not Provide Probability Greater than 95% Reliability.Caused Under Investigation. Testing Extended to 100% Verification of Anchors on Pipe

Event date:
Report date:
3481979021R01 - NRC Website

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2 lIn response to IE Bulletin 79-02, Alabama Power Company initiated a program to I

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ALABAMA POWER COMPANY JOSEPH M. FARLEY NUCLEAR PLANT DOCKET NO. 50-348 ATTACHMENT TO LER 79-021/0lT-3 Facility:

Joseph M. Farley Unit 1 Report Date:

6/19/79 Event Date:

4/12/79 Identification of Event Potential for anchor bolt failures and the resultant possibility of hanger failure in certain systems.

Conditions Prior to Event

The unit was in mode 6 (refueling).

Description of Event

In response to IE Bulletin 79-02, Alabama Power Company initiated a program to randomly select and test a sample of anchor bolts installed in Seismic Category I, Safety Related, 2 inch and greater piping systems.

Initial results of that program revealed that statistical sampling would not be sufficient to provide a high probability of greater than 95% anchor bolt reliability. The potential for anchor bolt failures and the resultant possibility of hanger failure were reported to the NRC on 4/12/79 under the potential applicability of Technical Specification 6.9.1.8(i).

Subject bolts were manufactured by Phillips Drill Co., Hilti Fastening Systems Incorporated and Wej-It Corporation.

Designation of Apparent Cause Under investigation.

Analysis of Event

Alabama Power Company initiated a program to randomly select and test a sample of anchor bolts installed in Seismic Category I, Safety Related, 2 inch and greater piping systems.

Initial results of that program revealed that statistical sampling would not be sufficient to provide a high probability of greater than 95% anchor bolt reliability. Also, it has been found that design, documentation and installation deficiencies exist on pipe hangers. The health and safety of the public is not affected.

2238 201

79-021/01T-3

Corrective Action

The anchor bolt testing program has been expanded to include 100%

verification of acceptable anchors on pipe hangers for those systems or portions of systems required to meet design basis accidents and those required to bring the plant to cold shutdown.

This piping includes:

Seismic Category I; Safety-Related 2-1/2 inch and above.

a.

b.

Seismic Category I; Safety-Related Class I under 2-1/2 inch.

Seismic Category I; Safety-Related of other classes for which c.

the designer performed detailed analysis, d.

All piping through containment penetrations.

The systems involved in the above verification include the following:

1.

Component Cooling Water System 2.

Service Water System 3.

Sampling System 4.

Chemical Volume and Control System 5.

Residual Heat Removal System 6.

Main Steam System 7.

Containment Cooling System 8.

Reactor Coolant System 9.

Emergency Core Cooling System 10.

Main Feedwater System 11.

Emergency Diesel Generator with Fuel Oil System 12.

Gaseous Waste System 13.

Post Accident Containment Hydrogen Control System 14.

Auxiliary Feedwater System 15.

Containment Spray System 16.

Condensate Storage Tank 202

79-021/01T-3 17.

Containment Isolation System 18.

Main Steam Safety and Relief Valve Systems The overall scope of the above verification program includes approximately.12,000 anchor bolts.

Engineering design organizations are participating in determining test acceptance criteria which will ensure proper anchor bolt safety margins. Designers will verify the adequacy of pipe hangers within the verification program. This will include verification of hanger design and anchor bolt loadings. The necessary corrective action will be accomplished on each system to ensure operability.

The results of the verification will be included in the evaluation covering all portions of all Seismic Category I systems required by IE Bulletin 79-02.

A supplemental LER will be submitted when corrective actions required have been identified. Farley Nuclear Plant will not return to power range reactor operation until such time as Alabama Power Company and NRC Region II mutually agree that potential safety questions have been satisfactorily resolved.

Failure Data None 2238 203