ML19325D286
| ML19325D286 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/16/1989 |
| From: | William Cahill, Woodlan D TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-89755, NUDOCS 8910230012 | |
| Download: ML19325D286 (4) | |
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""""l Log # TXX 89755 L
Z File # 10010 C
C 909.5
- C'R'**
- nlELECTRIC October 16, 1989 W. J. Cabul br< utns % l'erudent U. S. Nuclear Regulatory Commission Attn: Document Control Desk I
Washington, D. C.
20555 i
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) l DOCKET NO. 50-445 l
l EMERGENCY O!ESEL GENERATOR ENGINE REQUIREMENTS 1
REF:
NRC letter from C. I. Grimes to W. J. Cahill, Jr.,
dated September 18, 1989.
Gentlemen:
Th'e referenced letter identifies a licensing issue regarding the Emergency I
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-Diesel Generator requirements. TV Electric hereby confirms its commitment to complete the Emergency Diesel Generator requirements as described in the.
Changes to the maintenance / surveillance program as described in TU Electric letters TXX-6236, dated February 13, 1987, and TXX-89077, dated February 24, 1989, for the Emergency Diesel Generator will be made in i
accordance with the provisions of 10CFR50.59.
Sincerely, i
William J. Cahill, Jr.
s By:
i Don R. Woodlan l
l Docket Licensing Manager
.I HCP/smp Attachment i
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l c - Mr. R. D. Martin. Region IV Resident Inspectors CPSES (3)
Mr. J. H. Wilson, OSP-NRC 1
8910230012 891016 pq PDR ADOCK 05000445 A
FDC l \\
l 400 North Ohve Street LB R1 Dallas, Texas 75201
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') Attachmint I to TXX-89755 Pag 3 1 of 3 J
ATTACHMENT 1 TDI DIESEL ENGINE REQUIREMENTS l
- 1) SGG6k o
Changes to the maintenance / surveillance program as described in TU l
Electric letters TXX 6236, dated February 13 1987 and TXX-89077, dated February 24, 1989, for the TransAmerica Delaval, Inc.(TDI) Emergency Diesel Engines shall be subject to the. provisions of 10 CFR 50.59.
o The frequency of the major engine overhauls referred to in the license conditions below shall be consistent with Section IV.1, " Overhaul Frequency," in Revision 2 of Appendix II of the Design Review / Quality Reva11dation Report that was transmitted by letter dated May 1, 1986, from J. B. George. Owners Group, to H. R. Denton, NRC.
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- 2) CONNECTING RODS Connecting rod assemblies shall be subjected to the following inspections at each major engine overhaul:
o The surfaceL of the rack teeth shall be inspected for sign of fretting.
If fretting has occurred, it shall be subject to an engineering evaluation for appropriate corrective action.
o All connecting rod bolts shall be lubricated in accordance with the engine manufacturer's instructions and torqued to the specifications of the manufacturer.
The lengths of the two pairs of bolts above the crankpin shall be measured ultrasonically before and after tensioning.
o The lengths of the two pairs of bolts above the crankpin shall be measured ultrasonically before detensioning and disassembly of the bolts.
If bolt tension is less than of the value at installation, the cause shall be determined, appropriate corrective action shall be taken, and the interval between checks of bolt tension shall be reevaluated, o
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 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.
o A visual inspection shall be performed of all external surfaces of the link rod box to verify the abserce of any signs of service-induced s'ress, l
o All of the bolts holes in the link rnd box shall be inspected for thread
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damage (e.g., galling), or other signs of abnormalities.
In addition, the bolt holes subject to the highest stresses (i.e., the pair immediately t
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) Attach ent 1 to TXX-89755 Page 2 of 3 i
above the crankpin) shall be examined with an appropriate nondestructive method to verify the continued absence of cracking. Any indications shall be recorded for engineering evaluation and appropriate corrective action.
- 3) [1LINDER BLOCKS l
o Cylinder blocks shall be inspected for " ligament" cracks, " stud to stud" cracks and " stud-to-end" cracks as defined in a report by Failure Anclysis Associates Inc. (FaAA) entitled " Design Review of TDI-R-4 and RV 4 Series Emergency Diesel Generator Cylinder Blocks" (FaAA Report No. FaAA 84 9-11.1) and dated December 1984. (Note that the FaAA report specifies i
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 methods i
shall be consistent with or equivalent to those identified in the subject FaAA report.
o 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, which was exposed because of the removal of two or more cylinder heads.
This process shall be repeated over several refualing outages until the entire block has been inspected.
Liquid penet: 0 t testing or a similarly sensitive nondestructive testing technique shall be used to detect cracking, and eddy current testing shall be used as appropriate to determine the depth of any cracks discovered.
o If inspection reveals cracks in the cylinder blocks 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.
- 4) CYLINDER HEADS The following air roll test shall be performed below, except when the plant is i
already in an Action statement of Technical SDecification 3/4.8.1. " Electric Power Systems A.C. Sources":
o The engine shall be rolled over with the airstart system and with the i
cylinder stopcocks open before 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.
(If an engine l
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Attach ent I to TXX 89755 Page 3 of 3 is removed from service for any reason other than the rolling over procedure before expiration of the 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> periods noted above, j
that engine need not be rolled over while it is out of tervice.
The licensee shall air roll the engine over with the stopcocks open at the i
time it is returned to service.) The origin of any water detected in the cylinder must be determined and any cylinder head that leaks because of a crack shall be replaced. The above air-roll test may be discontinued l
following the first refueling outage subject to the following conditions.
o All cylinder heads are Group III heads (i.e., cast after September, 1980).
Group !!! heads continue to demonstrate favorable leakage performance.
This will be confirmed with TDI before air-roll tests are discontinued.
- 5) IURB0 CHARGERS Periodic inspections of the turbochargers shall include the following:
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o The turbocharger thrust bearings shall be visually inspected for excessive wear after 40 non prelubed starts since the previous visual inspection, o
Turbocharger rotor axial clearance shall be measured at each refueling outage to verify compliance with TDI/Ellict specifications.
In addition, thrust bearing measurements shall be compared with measurements taken previously to determine a need for further inspection or corrective
- action, I
o 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, o
The nozzle ring components and inlet guide vanes shall be visually inspected at each refueling outage for missing parts or parts showing distress on a one-turbocharger-per-refueling-outage basis.
In addition, these inspections shall be performed for all turbochargers at each turbocharger overhaul (i.e., at approximately 5-year intervals).
If any missing parts or distress is noted, the entire ring assembly shall be replaced and the subject turbocharger shall be einspected at the next refueling outage.
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