ML20214Q070

Safety Evaluation Supporting Proposed Records Storage Ctr & Deviations from NFPA Std 232 & ANSI N45.2-1974

ML20214Q070
Person / Time
Site:	Fort Saint Vrain
Issue date:	09/18/1986
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20214Q067	List: ML20214Q064 ML20214Q070
References
TAC-61578, NUDOCS 8609240164
Download: ML20214Q070 (2)

Text

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATING TO PROPOSED RECORD STORAGE CENTER PUBLIC SERVICE COMPANY OF COLORADO FORT ST. VRAIN NUCLEAR GENERATING STATION DOCKET NO. 50-267

1.0 INTRODUCTION

The licensee plans to build a new Record Storage Center adjacent to the existing record storage office. By letter dated April 25, 1986, the licensee requested approval of ten deviations to the codes and standards that ensure adequate protection of the documents to be contained in this new Record Storage Center. The specific codes and standards for which a the licensee requested deviations are National Fire Protection Association (NFPA) Standard No. 232 (which pertains to fire protection for record storage facilities) and ANSI N45.2.9-1974 (which pertains to

, collection, storage, and maintenance of Quality Assurance records). Both of these standards are referenced in NRC Standard Review Plan a (NUREG-0800) Section 17.1.17.4.

2.0 EVALUATION 2.1 Fire Protection y After reviewing the licensee's deviation requests related to fire protection, the staff expressed concern regarding the fire resistance of the exterior walls and ceiling / roof assembly, as well as the design for the automatic and manual fire protection systems. The licensee responded to these concerns by letter dated August 15,1986(P-86516). The exterior walls will be fire rated at two hours. In order to achieve this rating, the doors and dampers will be rated for three hours. The staff concludes that this level of fire resistance is sufficient to provide protection from any potential external exposure fire.

The ceiling / roof assembly will be supported by unprotected steel. The licensee responded to the staff's concern about the structural integrity of this steel during a fire exposure by describing the design of the proposed halon fire suppression system, fire detection and alarm system, and manual fire fighting equipment. The fire detection and alarm system will be designed in accordance with NFPA Standards Nos. 72D and 72E. The halon system will be designed in accordance with NFPA Standard No. 12A.

It will be capable of providing a sufficient concentration of halon gas to control any potential fire within the storage area, and is designed to 8609240164 860915 PDR ADOCK 05000267 F PDR l

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, have a 100% reserve supply of halon gas. Portable fire extinguishers will be provided in accordance with NFPA Standard No. 10. On this basis, the. staff concludes that an adequate level of fire protection will be provided to protect against a potential internal exposure fire.

2.2 Missile Generation ANSI N45.2.9-1974 states that permanent record storage facilities be so constructed as to protect their contents from possible destruction by causes such as fire, flooding, and tornados. The licensee requested a deviation from ANSI N45.2.9-1974 to build the new Record Storage Center to withstand winds with speeds up to 100 mph instead of tornado-force winds (windspeeds up to 300 mph). In view of the fact that the plant is designed to be capable of safe shutdown following a maximum tornado with a 300 mph total horizontal wind velocity, the staff requested that the licensee demonstrate that any missiles resulting from the failure of the

. Record Storage Center will not damage any Category I structure or safety 4

related equipment. In response to the staff's request, the licensee evaluated the potential tornado generated missiles and reported that

_ neither the weight nor shape of the potential missiles would exceed the FSV design missile (fir plank, 4" X 12" x 12 ft. long, weighing 105 lbs).

This missile was used as the design missile in determining the thickness requirement of the Prestressed Concrete Reactor Vessel shield deck structure. Since the existing non-Category I structures at the FSV plant are similar to the proposed storage facility, it can be concluded that no new credible potential missiles can be generated by a tornado and that the existing Category I structures will be adequately protected.

3.0 CONCLUSION

S The level of fire protection proposed by the licensee will achieve an equivalent level to that which would be achieved by complete compliance with NFPA Standard No. 232. Therefore, the licensee's request for deviations from this standard is acceptable.

Similarly, the licensee's request for a deviation from ANSI N45.2.9-1974 is acceptable because any missiles resulting from the failure of the new Record Storage Center will not damage any Category I structure or safety-related equipment.

Based on the above findings, the staff approves the ten deviation requests contained in the licensee's April 25, 1986 letter (P-86069) from D. Warembourg (PSC) to H. Berkow (NRC). With the exception of these ten deviations, the design of the new Record Storage Center will be in accordance with the NRC Standard Review Plan (NUREG-0800) Section 17.1.17.4 concerning the design of suitable facilities for the storage of Quality Assurance records.

Principal Contributors: D. Kubicki R. Lipinski Dated: September 18, 1986

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