ML20206U639: Difference between revisions

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{{Adams
#REDIRECT [[AECM-86-0284, Provides Info Re Permissible Lowest Svc Metal Temp for Feedwater Check Valve Disc Addressed in OL Condition 2.C(17),per 860905 Request.Fee Paid]]
| number = ML20206U639
| issue date = 09/26/1986
| title = Provides Info Re Permissible Lowest Svc Metal Temp for Feedwater Check Valve Disc Addressed in OL Condition 2.C(17),per 860905 Request.Fee Paid
| author name = Kingsley O
| author affiliation = MISSISSIPPI POWER & LIGHT CO.
| addressee name = Denton H
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000416
| license number =
| contact person =
| document report number = AECM-86-0284, AECM-86-284, TAC-62963, NUDOCS 8610080065
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 2
}}
 
=Text=
{{#Wiki_filter:_ _ _ _ _  _ _ _ _                __          _                                              _
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MISSISSIPPI POWER & LIGHT COMPANY
                                            ]
EdhhlhMiddB Helping Build Mississippi P. O. B O X 18 4 0, J A C K S O N , MISSISSlPPI 39215-1640 Septeraber 26, 1986 O. D. KINGSLEY, J R.
t?tCE PREllDENT NUCLEAR OPERATIONS U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D. C.                                      20555 Attention: Mr. Harold R. Denton, Director
 
==Dear Mr. Denton:==
 
==SUBJECT:==
Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-29 Operating License Condition 2.C(17)
Feedwater Check Valve Disc AECM-86/0284 The purpose of this letter is to provide information requested by your
;                          staff on September 5,1986. This information pertains to the permissible Lowest Service Metal Temperature (LSMT) for the feedwater check valve disc addressed in Operating License Condition 2.C(17).
AsstatedinMP&L'slettertotheNRCdatedSeptemger1,1981 (AECM-81/0340), the LSMT for Train B of Feedwater is 60 F.                                                                                          As the nil dugtilitytransitiontemperatureforthediscofvalveB21-F0328(TrainB)was 78 F, the disc was replaced.
The material specification for the replacement disc is ASME SA351 CF8M.
ThgnilductilitytransitiontemperatureforASMESA351GradeCF8Mislessthan 32 F.        Since this is below the LSMT for Train B of Feedwater, brittle fracture concerns regarding this component are resolved, and the subject license condition is satisfied.
In the September 1, 1981 letter MP&L stated that the Train A valve (B21-F032A) for Feedveater has a LSMT which is acceptable forg the disc associated with valve B21-F032A. The LSMT for Train A is 80 F, and the nil ductility transition temperature for the disc of valve B21-F032A is below this temperature. Therefore the disc of 821-F032A was not replaced.
As discussed with Mr. L. L. Kintner of your staff, MP&L is considering the possibility of replacing the discs of both Train A and B feedwater check valves with discs supplied with soft seats to improve the local leak rate results for these valves. The soft seats of the replacement discs are fabricated from 8610090065 860926 PDR ADOCK 05000416                                                                                                                          I 0 P                                                                              FDR J16AECM86091001 - 1                                                    Member Middle South Utilities System
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _                                                                        At cNHeCW            **
 
r                                                                                        l
  .. 5                                                                                    \
AECM-86/0284  i Page 2        ;
      ' Ethylene-Propylene Rubber. The structural member of the replacement disc for B21-F0328 is fabricated from ASME SA351 Grade CF8M. Thus, brittle fracture will not be a concern.
In accordance with the requirements of 10CFR170.21, an application fee' of
        $150 is attached.
If additional information is needed, please contact this office.
Your  ruly,
                                                        /
                                                      /      b ODK:bms Attachment cc: Mr. T. H. Cloninger (w/a)
Mr. R. B. McGehee (w/a)
Mr. N. S. Reynolds (w/a)
Mr. H. L. Thomas (w/o)
Mr. R. C. Butcher (w/a)
Mr. James M. Taylor, Director (w/a)
Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555' Dr. J. Nelson Grace, Regional Administrator (w/a)
U. S. Nuclear Regulatory Commission Region II 101 Marietta St., N. W., Suite 2900 Atlanta, Georgia 30323 J16AECM86091001 - 2}}

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