ML19209B148
| ML19209B148 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 09/14/1979 |
| From: | Wolf J Atomic Safety and Licensing Board Panel |
| To: | |
| References | |
| NUDOCS 7910090234 | |
| Download: ML19209B148 (3) | |
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UNITED STATES OF AMERICA
- g NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD d
In the Matter of
)
Docket Nos. 50-295
)
50-304 COMMONWEALTH EDISON CO.
)
Proposed Amendment to
)
Facility Operating (Zion Station, Units 1 and 2
)
License No. DRR-39 and DPR-48 to permit storage pool modifi-cation MEMORANDUM AND ORDER (September 14, 1979)
Shortly after the submission of Proposed Findings of Fact and Conclusions of Law by the Parties, in this matter, this Board was apprised by a Board Notification entitled " Pipe Cracks in Stagnant Borated Water Systems at PWRs" dated August 14, 1979, and IE Bulletin 79-17 that the use of type 304 stainless steel raised possible problems under the conditions found in the Zion spent fuel pool.
This information has caused the Board to reopen the record primarily to receive evidence regarding the safety of the proposed fuel storage racks to be used in the Zion spent fuel pool.
The Board Notification and IE Bulletin 79-17 indicate that localized intergranular stress corrosion cracking has occurred in type 304 s.tainless steel systems containing oxygen-ated, stagnant or essentially stagnant, borated water.
The Staff indicates that the safety significance of cracks in low pressure spent fuel cooling systems is considered to be nil.
1 11i2 305
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71n0090 6
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The evidentiary record of this proceeding indicates that there is stainless steel in the pool liner, in the spent fue?.
assemblies, in the spent fuel pool cooling system and in the proposed fuel storage racks.
The stainless steel would be exposed to oxygen-saturated, borated water in the speat fuel pool, if the proposed amendment is issued.
Further, the record indicates that the mechanical strength of the type 304 stainless steel in the proposed racks would be relied upon by the design of the racks, and that stagnant water would exist within the vented tubes of the proposed fuel storage racks.
The record is not clear as to the type of stainless steel in the liner, in the fuel assemblies or in the spent fuel pool cooling system.
Further, the record is not clear as to the extent to which the water in the pool would be stagnant or essentially stagnant nor to the extent that the water is oxygenated.
Accordingly, the Parties are directed to provide affi-davits which state the extent to which type 304 stainless steel will be present in the pool according to the proposed modification plan.
Further, in light of the new information contained in the Board Notification, the affidavits will state what effects, if any, on the type 304 stainless steel would occur as a result of being immersed or in contact with the water in the spent fuel storage pool.
The Applicant will have to and including October 5, 1979, in which to file its affidavit.
The NRC Staff's affidavit 1112 606
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will be due on October 19, 1979, and the Intervenor, the State of Illinois, will file its affidavit on November 2, 1979.
Any rebuttal affidavits are to be filed by November 15, 1979 IT IS SO ORDERED.
FOR THE ATOMIC SAFETY AND LICENSING BOARD L
t-by John F. Wolf, Ch rman Issued this 14th day
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of September, 1979 at Bethesda, Maryland 1112 307