ML20211M423
| ML20211M423 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/09/1986 |
| From: | Butler W Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20211M428 | List: |
| References | |
| TAC-61970, NUDOCS 8612170249 | |
| Download: ML20211M423 (7) | |
Text
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'o UNITED STATES
[\\, c.f, ',j NUCLEAR REGULATORY COMMISSION c
WASHINGTON, D. C. 20555 M
1 MISSISSIPhiPOWEPALIGHTCOMPANY MIDDLE SOUTH ENERGY, INC.
SOUTH MISSISSIPPI ELECTRIC POWER ASSOCIATION DOCKET NO. 50-416 GRAND GULFTNUCLEAR STATION, UNIT 1 AMENDMENT TO FACILITY OPERATING LICENSE t
i Amendment No. 26 License No. NPF-29 1.
The Nuclear Regulatory Commission (the Commission) has found that:
i A.
The application for amendment by Mississippi Power & Light Company, Middle South Energy, Inc., and South Mississippi Electric Power Association, (the licensees) dated September 12, 1986 as supplemented November 7,1986, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and reculations set forth, in 10 CFR Chapter I; i
/ B..
The facility will operate.in conformity with the application, the provisionsoftheAct.jandtherulesandregulationsofthe Commission, t
There is reasonable as' urance (i) that' the activities authorized by C.
s this amendment can be 'onducted without endangering the health and c
safety of the public, and (ii) that such activities will be conducted incompliancewiththel Commission'sregulations; I
D.
The issuance of this amendment will not be inimical to the coninon defense and security 0r to the health and safety of the public; and The issuarce of this a'endment is in accordance with 10 CFR Part 51 E.
m of the Commission's reculations and all applicable requirements have been satisfied.
1 2.
Accordingly, Facility Operating License NPF-29 is amended as follows:
i A.
Change paragraph 2.C.(25)(b) to read as follows:
(b) MP&L shall comply with the TDI emergency diesel generator requirements spec,1fied in Attachment 2 to this license.
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3.
This' license ' amendment is effective as of its date of issuance.
FOR THE NUCLEAR REGULATORY COMMISSION p sw d by Walter R. Butler, Director BWR Project Directorate No. 4 Division of BWR Licensing A'ttachmenti Attachment'2 to the License g
Date of Issuance: Deceraber 9,1986 1,
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. 3.
This license an;endment is effective as of its date of issuance.
FOR THE NUCLEAR REGULATORY COMMISSION
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Walter R. Butler, Director BWR Project Directorate No. 4 Division of BWR Licensing
Attachment:
to the License Date of Issuance:
December 9, 1986 4
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Transamerica Delaval Inc. (TDI) Diesel Generator Maintenance and Surveiniance Requirements (NUREG-1216. Auaust 1986) 1.
Maintenance and Surveillance Procram MP&L shall implement and maintain in effect the provisions of the main-
'tenance and surveillance program for the TDI emergency diesel generators at GGNS Unit I as identified in the PP&L letter dated July 18, 1986
'(AECM-86/0172) and as approved in the staff's Safety Evaluation Report attached to the NRC letter dated December 9,1986, subject to the provisions of paragraphs 2 and 3 below.
2.
Chanaes MP&L may make changes to the approved maintenance and surveillance
-program without prior approval of the Commission provided the changes do not adversely affect the operability or reliability of the diesel generators or involve changes in the Phase 1 Surveillance requirements of paragraph 3 below or otherwise change license conditions or Technical
' Specifications or result in an unreviewed safety question as defined in
<10 CFR 50.59. MP&L shall maintain in auditable form, a current record of tall'such changes, including an analysis of the effects of the change on i
diesel generator operability and reliability, and shall make such records available to NRC inspectors upon request. All changes to the program shall be reported annually to the Director of the Office of Nuclear Reactor Regulation, along with the FSAR revisions required by 10 CFR 50.71(e).
3.
Phase 1 Component Surveillance Requirements 1
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MP&L shall comply with the following requirements:
3.1 Connecting Rods F
Connecting rod assemblies shall be subjected to the following i
l inspections at each major engine overhaul *:
a.
The surfaces of the rack teeth shall be inspected for signs of fretting.
If fretting has occurred, it shall be subject to an engineering evaluation for appropriate corrective action.
i l.
i The frequency of the major engine overhauls referred to in these requirements h
l shall be consistent with Section IV.I.
" Overhaul Frequency" in Revision 2 l
of Appendix II of the Design Review / Quality Revalidation report which was transmitted by MP&L letter dated July 18, 1986.
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4 b.
All connecting-rod bolts shall be-lubricated in accordance with the engine tranufacturer's instructions and torqued to the speci-fications of the manufacturer. The lengths of the two pairs of bolts above the crankpin shall be measured ultrasonically pre and post-tensioning.
c.
The lengths of the two pair of bolts above the crankpfr shall be measured ultrasonically prior to detensioning and disassembly of the bolts.
If bolt tension is less than an eouivalent of 2400 ft-lbs, the cause shall be detennined, appropriate corrective action shall be taken, and the interval between checks of bolt tension shall be re-evaluated, d.
All connecting-rod bolts shall be visually inspected for thread damage (e.g., galling), and the two pairs of connecting rod bolts above the crankpin shall be inspected by magnetic particle testing (MT) to verify the continued absence of cracking. All washers used with the bolts shall be examined visually for signs of galling or cracking, and replaced if damaged.
e.
A visual inspection shall,be performed of accessible external surfaces of the link rod box to verify the absence of any signs of service induced distress.
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f.
All of the bolt holes in the link rod box shall be inspected for thread damage (e.g., galling) or other signs of abnormalities.
In addition, the bolt holes subject to the highest stresses (i.e.,
the pair immediately above the crankpin) shall be examined with an appropriate nondestructive method to verify the centinued absence of cracking. Any indications shall be recorded for engineering evaluation and appropriste corrective action.
g.
If the diesel generators are operated in excess of 5740 KW steady state, all connecting rods shall be disassembled and inspected at an interval of approximately 5 years coincident with the end.
of a fuel cycle, except that connecting rod disassembly and inspection is not required for limited post maintenance testing over 5740 KW for the purpose of seating new piston rings as described in the MP&L letter dated December 6, 1985 (AECM-85/0395).
3.2 Cylinder Blocks a.
Cylinder blocks shall be inspected for " ligament" cracks,
" stud-to-stud" cracks and " stud-to-end" cracks as defined in a report by Failure Analysis Associates, Inc. (FaAA) entitled, "Desian Review of TDI R-4 and RV-4 Series Emergency Diesel Generator Cylinder Blocks" (FaAA report no. FaAA-84-9-11.1) dated December 1984.**
(Note that the FaAA report specifies i
Transmitted to H. R. Denton, NRC from C. L. Ray, Jr., TDI Owners Group, by letter dated December 11, 1984.
4 additional inspections to be performed for blocks with "known" or " assumed" ligament cracks). The inspection intervals (i.e.,
frequency) shall not exceed the intervals calculated using the cumulative damage index model in the subject FaAA report.
In addition, inspection method shall be consistent with or equivalent to those identified in the subject FaAA report.
b.
In addition to inspections specified in the aforementioned FaAA report, blocks with "known" or " assumed" ligament cracks (as defined in the FaAA report) shall be inspected at each refueling outage to determine whether or not cracks have initiated on the top surface exposed by the removal of two or more cylinc'cr heads. This process shall be repeated over several refusling outages until the entire block top has been inspected. Liquid-penetrant testing or a similarly sensitive nondestructive testing technique shall be used to detect cracking, and eddy current shall be used as appropriate to detennine the depth of any cracks discovered.
c.
If inspection reveals cracks in the cylinder biccks between stud holes of adjacent cylinders (" stud-to-stud" cracks) or
" stud-to-end" cracks, this' condition shall be reported. promptly to the NRC staff and the affected engine shall be considered inoperable. The engine shall not be restored to " operable" status until the proposed disposition and/or corrective actions have been approved by the NRC staff.
3.3 Cylinder Heads The following air roll test shall be performed as specified below, except when the plant is already in an Action Statement of Technical Specification 3/4.8.1, " Electric Power Systems, A.C. Sources":
' The engines shall be rolled over with the airstart system and with the cylinder stopcocks open prior to each planned start, unless that start occurs within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of a shutdown. The engines shall also be rolled over with the airstart system and with the cylinder stopcocks open after 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, but no more than 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> after engine shutdown and then rolled over once again approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after each shutdown.
(In the event an engine is removed from service for
'any reason other than the rollina over procedure prior to expiration of the 8-hour or 24-hour periods noted above, that engine reed not be rolled over while it is out of service. The licensee shall air roll the engine over with the stopcocks open at the time it is returned to service.) The origin of any water detected in the cylinder must be determined and any cylinder head which leaks due to a crack shall be replaced. The above air roll test may be discon-tinued following the first refueling outage subject to the following conditions:
l a.,.All cylinder heads are Group III heads (i.e cast after September 1980.)
i b.
Quality revalidation inspections, as identified in the GGNS Desion Review / Quality Revalidation Report, Revision 2, have
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been comploted for all cylinder heads.
c.
Group III heads continue to demonstrate *avorable lerkage performance. This should be confirmed with TDI prior to deleting air roll tests.
3.4 Turbochargers Periodic inspections of the turbochargers shall include the following:
a.
The turbocharger thrust bearinos shall be visually inspected for excessive wear after 40 non-prelubed starts since the previous visual inspection.
b.
Turbocharger. rotor axial clearance shall be measured at each refueling outage to verify. compliance with TDI/Elliott specifications.
In addition, thrust bearing measurements shall be compared with measurements taken previously to determine a need for further inspection or corrective action.
c.
Spectrographic and ferrographic engine oil analysis shall be performed quarterly to provide early evidence of bearing degradation.
Particular attention shall be paid to copper level and particulate size which could signify thrust bearing degradation.
f d.
The nozzle ring components and inlet guide vanes shall be visually inspected at each refueling outa;e for missing parts or parts showing distress.
If such are noted, the entire ring assembly shall be replaced.
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