ML20077K075
| ML20077K075 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 07/30/1991 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-001, IEB-89-1, NUDOCS 9108060322 | |
| Download: ML20077K075 (4) | |
Text
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!Juclear Regulatory Commission Attn:
Document Control Desk Washington, DC 20555 WR.t !v. st ; llenver Valley Power Station, Unit tio. 1 and tJo. 2 IIV -I Docket 110. 50-334, Licenne 1J0. DPit-66 IIV-2 Docket 1J0. 50-412, l.i c e n u e ti o. 11PF-73 IJRC Dulletin 89-01, Supplement 2 Attached is the Duquesne Light Company responne to iWe Dulletin 89-01, Supplement 2
" Failure of Wostinghouse Steam Oceormt.a? Tube Mechanical Plugs."
The attachment provides the af.l.: ora taken at Beaver Valley Power Station Units 1 & 2 to meet the requsc'ements of the Bulletin.
If you have any questions concerning thin
- renponse, please contact Mr. Brian F.
Sepelak at (412) 393-5282.
Sincerely,
(
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[J.
D.
Sieber
'Vice President IJuclear Group Attachment cc:
Mr.
J.
Beall, Sr. Resident Inspector Mr. T.
T.
Martin, !JRC Region I Administrator Mr.
A.
W.
DeAgazio, Project Manager Mr.
M.
L.
Bowling (VEPCO)
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I COMMO!JWEALTH OF PE!J!JSYLVA111 A)
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On this day of Y(6/-
- 1991, 11[Ls
[OId W, a 11ot ry P lic in and for caid before me g
Commonwealth and County, personally appeared J.
D.
Sieber, who being duly sworn, deposed, and said that (1) he is Vice President 11uclea r of Duquesne Light, (2) he in duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge, information Ltnd bellet.
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DUQUESNE LIGHT COMPANY Nuclear Group Beaver Valley power Station Unit No. 1 and 2 Attachment Reply _t9_11RC_JndledB 89-E_Svenleeent 2 Item 1.
Addressees are requested to verify that information contained in Table 2
of Reference 4
for their plants is correct for plugs fabricated from group 2 heats.
(Addressees have previously verified similar information for group 1
plugs in response to the original bulletin.)
The specific information to be verified in the number of Westinghouse mechanical plugs installed in the hot-leg and cold-leg side of each steam generator, categorized by heat number and date of installation.
The plug operating temperatures for each plant given in this Table should also be verified.
If information from this Table is incorrect, addressees should provide correct information.
Addressees are requested to so state if their plants have not installed Westinghouse mechanical plugs from group 2 heats.
Rteponse We have reviewed the information contained in Tabic 2 of Reference 4 (WCAP-12244, Revision 3,
Addendum 2) for Beaver Valley Unit 1 (BV-1) and Beaver Valley Unit 2 (BV-2).
The information provided in Table 2 is correct for number of plugs, plug heat number, steam generator hot leg or cold
- leg, and date of installation for both BV-1 and BV-2.
- However, the plug operating temperature for the BV-1 hot leg (HL) should be approximately 607'F.
The remaining plug operating temperatures for BV-1 and BV-2 are correct.
lien 2 Addressees are requested to take the following
- actions, to be implemented initially during any refueling outage or extended outage (greater than four weeks) which ends 60 days or more following receipt of this bulletin and during all future refueling outages.
For the period of time between receipt of the bulletin and 60 days, the actions requested in the original version of this bulletin continue to be applicable for plugs fabricated from group 1 heats.
a)
Addressees should implement appropriate remedial actions (i.e.,
repair and/or replacement) for all plugs whose estimated lifetime in item 2b, below does not extend to the next refueling outage.
b)
Remaining lifetime estimates (in effective full power days
( EFPD) )
are given in Table 2
of Reference 4
in the column entitled
" Remain EFPD to MIN."
These remaining lifetime estimates are relative to reference dates given in the column entitled
" Reference CALC Dates."
These remaining lifetime estimates may be used directly.
These estimates should be adjusted to reflect any corrections noted in ILetions Renuested, c
item 1.
Attachment Reply to NRC Bulletin 89-01, Supp. 2 Page 2
- c)
For-refueling outages or extended outages ending prior to November 30,
- 1991, remedial actions for plugs fabricated from NX-5222 may be deferred until the next scheduled refueling
- outage, d)
Installation of Westinghouse mechanical plugs fabricated from Inconol-600 should be discontinued.
c)
If for any refueling
- outago, the addresseo does not plan to 4
satisfy items 2a to 2d above, an alternative plant for insuring plug integrity, with appropriate technical justification, should be submitted-to the NRC at least 30 days before the end of the refueling outage.
f)
Prior to any_ plug repairs or replacement, addressees are-reminded that-their-responsibilities under AbARA require analysis of the various plug repair uor replacement methods.
In choosing'a plug repair or replacement
- method, the licensco should consider the accessibility of the plugs and the dose reduction benefit of using robotic manipulators.
Prior to plug repair or replacement, the licensoo should considor steam generator decontamination and/or local shielding to reduce working area dose rates.
ResnoDES All of the Westinghouse Alloy 600 steam generator tubo mechanical plugs installed in BV-1 and DV-2 have been repaired using either the Westinghouse
" plug-in-plug" or Babcock Wilcox
" plug-and-plug" method.
At BV-1, the repairs were performed during the seventh and eighth _ refueling outages.
At BV-2, the repairs were performed during the first and second refueling outages.
In-accordance with.-Item 2.d, installation of Westinghouse mechanical plugs fabricated from Inconel 600 will be prohibited at BV-1_and
-v BV-2.
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