RBG-21276, Forwards Operational Safety of Tdi DSR-48 Emergency Diesel Generator Crankshafts at River Bend Station,Gulf States Utils & Addl Info Requested by NRC to Confirm Qualification of Tdi Standby Diesel Generators

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Forwards Operational Safety of Tdi DSR-48 Emergency Diesel Generator Crankshafts at River Bend Station,Gulf States Utils & Addl Info Requested by NRC to Confirm Qualification of Tdi Standby Diesel Generators
ML20127K588
Person / Time
Site: River Bend Entergy icon.png
Issue date: 06/12/1985
From: Booker J
GULF STATES UTILITIES CO.
To: Harold Denton
Office of Nuclear Reactor Regulation
Shared Package
ML20127K591 List:
References
RBG-21276, NUDOCS 8506270500
Download: ML20127K588 (31)
v • d • e


Text

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GULF STATES UTILITIES COMPANY RIVER BEND STATION Pos? 0FFict 80x 220 ST. FRANCISVILLE, LoutSIANA 70775 AREA Co0E 504 635-3237 387-4257 June 12, 1985 RBG 21276 File No. G9.5 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission hashington, D.C. 20555

Dear Mr. Denton:

River Bend Station - Unit 1 Docket No. 50-458 Enclosed for your review is the Gulf States Utilities Company (GSU) addi-tional information requested by members of your staff to confirm qualification of the River _ Bend Station (RBS) Transamerica Delaval, Inc.

(TDI) Standby Diesel Generators. Attachment 1 identifies the concerns raised and provides an appropriate response which meets the delineated conditions for approval of the TDI crankshafts for 3130 kw.

Sincerely, J. E. Booker Manager - Engineering, Nuclear Fuels S Licensing River Bend Nuclear Group RH/JWL/ebm Attachments (4)

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' 40 8506270500 DR 850612 g ADOCK 05000458 PDR i i

ATTACHMENT 1 The following information has been identified by Dr. Berlinger of the NRC Staff.for satisfactory approval of the RBS TDI crankshafts for a loading to 3130 kw:

1. Submit a report on FEV's independent evaluation of the RBS TDI crankshaft, signed by Dr. Franz Pischinger.
2. Address governor speed control to prevent operation near the 5th order critical.
3. Address monitoring or surveillance provisions to ensure pressure balance remains acceptable.
4. Perform a liquid penetrant (LP) inspection of crankpin fillets and oil hole entrance region of crankpins 5, 6 and 7 on the "A" Diesel. Crankpin oil holes on cylinders 5, 6 and 7 are to be eddy current tested (ET). Anf indication by LP inspection will be backed up by ET.
5. Inspection to be witnessed by a representative of Battelle Paci-fic Northwest Laboratories (PNL).

The response to each item is as follows:

1. See Attachment 4 for a copy of the FEV Report entitled " Operation-al Safety of TDI DSR-48 Emergency Diesel Generator Crankshafts at River Bend Station, Gulf States Utilities", dated June 1, 1985 and signed by Dr. Franz Pischinger.
2. See Attachment 2 for the combined response on Governor Speed Control and Cylinder firing pressure control.
3. See Attachment 2
4. See Attachment 3 for copies of three inspection reports, M5000501, M5000503 and M5000510. These inspections were conducted from June 4 to June 8, 1985 and confirm there is no evidence of fati-gue crach initiation after 330 hours0.00382 days <br />0.0917 hours <br />5.456349e-4 weeks <br />1.25565e-4 months <br /> of operation.
5. The inspections contained in Attachment 3 were witnessed by and a copy of the inspection report was given to Mr. S. J. Foreman of PNL.

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1 ATTACilMENT 2 This attachment contains the detailed response to Items 2 and 3 of Attach-ment 1.

NRC Staff Requirement: Describe means to control engine speed (frequency) and cylinder firing pressure to avoid increased crankshaft torsional stress from the fifth order resonant speed.

Response

The torsional stress contribution from the fifth order critical speed is addressed in " Evaluation of DSR-48 Emergency Diesel Generator Crank-1 shafts at River Bend Station," Failure Analysis Assosiates Report No.

FaAA-85-5-10 transmitted to Mr. H. R. Denton (NRC) from Mr. J. E. Booker (GSU) on May 16, 1985(GSU Letter No. RBG-21,025). The magnitude of the fifth order torsional vibration is quite small and there are six other orders with greater magnitude. Even though the fifth order speed is close to the operating speed, the fifth order is excited only by variations in combustion pressure from cylinder to cylinder. Such variations are readily detected by the exhaust thermocouples installed at each cylinder.

The following operating and maintenance practices will be adopted to pre-vent sustained operations under conditions of cylinder unbalance and over-speed:

1. A caution statement will be added to the operation and surveil-lance procedures from the Division I and Division II diesel genera-tors.

" Avoid continuous operation between 453 and 457 RPM (60.4 to 60.9 liz) . The crankshafts for the Division I and Division II diesels have a critical speed at 455 RPM. Crankshaft torsional stresses may be increased if the diesel generator operated at 455 RPM and cylinder firing pressures are unbalanced.

During operation, verify exhaust gas temperatures are within t 50F of the average for all cylinders. Variations exceeding this range for any cylinder should be investigated by Mainten-ance."

2. Exhaust gas temperature measurements for each cylinder will be recorded monthly, and cylinder firing pressures will be recorded

, quarterly. -Trend analysis will be performed to detect changes in parameters indicating a need for maintenance of fuel injection equipment.

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3. Station Operating Procedures S0P-0053, " Standby Diesel Generator and Auxiliaries," includes the requirement to monitor and main-tain generator frequency within 60 Hz 3 0.2 Hz.

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ATTACHMENr 3 This attachment contains three inspection reports, M5000501 (10 pages), M5000503 (8 pages) and M5000510 (8 pages), in response to Itan 4 of Attachment 1.

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Relevant 1 ho Arl' "~~l Fill out sketches below

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Distance from A Start Degree setting Start End

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End Magnitude of indication

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channel 1 Cha nel 2 <

Examiner 4 u

- Level I c.

d'8 -9 7 j

Examiner Level FsAA-G-12-1

i failure  ?@?Seos/0 2'*"f ""

Pago 1 or j[

D.

Assocates Eooy CURRENT EX AMIN ATION RECORD Sii. @ ,ocr Grad h k=> staNox o,,, 6 8 s NDE Procedure No. Il*3 Rev.No. 1 Job No. kkb3 Record No.86GOE-O/_0 Recording Criteria $n MrbudgW Component inspected C kN b1 d'b Component No. 3/83 9 /[db N M Description of Component Ol&5/! [YlM&W [*" Material On #So ^ S /'d /

Specific Examination Area C.va u kFla dd /d>/C. /3 ore, Material: O Worked O Welded ICast Surface Condition: O Machined D'A s F abricated O Ground O Other Geometry: O Pipe O Plate Rod O Other Cleaning Technique: C Wire Brush O Grind 0"O th e r [44M L P Recordable Part or Magnitude of Length of Weld No. Yes No indication Indication Location Remarks C4askafn I I I I i . .

7 L' \ l /i ~ ~ l - Wo 4tcedel/r [1-4w

'1 R f ' t/ ! - ~~ l

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\l i i l i N I I I I I I N i l l I IN I i i ,

i i iN I t i i i I N! i , I i i I h I 6 i l ,

NI

  • i i i l K i  !  ! l l l \ i l i i

l l \ i i i i  ! l NI I l  ! A I  ! I i N I i  ! N I I I N I i i N Attached Documents: O Continuation Sheet O Supplementary Sheet tos O Photo Log M ther Co /f 6p 4Yny d60 Inspector _

Level - Date bb This record is prelimi ry until signed below by NDE manager or designee Approved Title Date FaAA-M-84-12-Gt

i

, , ,. N$000A0

. P a g o.l.o t .2 Assc>ciates EDDY CURRENT CALIBRATION RECORD R e cord N o. bOS O 8' O/

  • Date b-O 'b Reference Standard b0/0@O9 Instrument NFJS& _02 #caf* V S/N I7 Test: db s olute O Differential Instrument gg Freq.[OOk Gain 32. dilter O Volts /niv: y H Phase NN Test Probe OAA U WO L S/N 20 Cable Length M Reference Probe 4M S/N &

Cable Length &

C alib r a tio n

,4 2 Units @ d'4 L/O NA Units @ M L/O 4A Units @ N L/O Units @ # L/O Strip Chart Oyes do Type S/N Channel 1 - Channel 2 Sen Sen Position Null Point Position Null Point Chart Speed (mm/sec)

Calibration Check Time Phase Gain Time Phase Gain Time Phase Gain

/oin / V'r 375 i to:st tys 3 7. 57aT

/6:01 /49 37.s-

/F:M I 49 3 7. 5 fo r Attached Documents: O Continuation Sheet O Supplementary Sheet O Pho o O Photo Log dth e r [ygentna f/dw [t ode c/

Inspecto e Ma Level Date This record is preliminar until signed below by NDE manager or designee Approved Title Date Fa A A-M 12- t

f ATI'ACHMENT 4 This attachment contains the FEV Report in response to Item 1 of Attachment 1.

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