ML20011D699

Addendum 1 to, Sacm Diesel Generator Qualification Rept.

ML20011D699
Person / Time
Site:	Prairie Island
Issue date:	12/12/1989
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20011D695	List: ML20011D694 ML20011D699 ML20011D702
References
NUDOCS 8912280289
Download: ML20011D699 (4)

Text

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i SACM DIESEL CENERATOR QUALIFICATION REPORT t

ADDENDUM 1 (DECEMBER 12, 1989)  ;

s The purpose of this Addendum is to respond to the questions generated by the NRC Staff review of the NSP DIESEL QUALIFICATION REPORT, Revision 0, dated 9/29/89. The NRC questions and NSP responses are listed below:

Ouestion Number 1:

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"The submittal did not address seismic qualification requirement as discussed in Section 7.4 of IEEE 387."

Response

The diesel generator sets for, Prairie Island Unit 2 will meet the seismic qualification requirements, as discussed in Section 7.4 of.IEEE 387 1984,.

prior to being placed in service. The diesel generator system equipment will be qualified by testing, analysis, or by combined testing and analysis, meeting the requirements of IEEE 344-1975 and NRC Regulatory Guide 1.100, Revision, August 1977.

The diesel generator purchase specification M 870~ delineates the Prairie Island specific seismic spectral-response criteria. The diesels'and.

generators themselver have been previously qualified to criteria which will be confirmed to be enveloping the Prairie Island specific criteria. :Some custom peripheral equipment such as the auxiliary desk and contrr.1 panel'will be directly qualified to the Prairie Island specific criteria.

Ouestion Number 2 :

"The submittal did not address the aging requirements as. discussed inLSection ,

7.3 of IEEE 387."

Response: ,

The aging requirements of the components and assemblies, as discussed in Section 7.3 of IEEE.387-1984 will be classified and qualified for the diosol generator' sets at Prairie Island Unit 2, prior to being placed in service.

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• ATIACHMENT to

. tt.t DatCd 12/15/69 rose 2 or 4 Ouestion Number 5:

"The submittal did not discuss the qualifications of the environment in which the equipment will be operated (i.e. R(.om Temperature and Humidity requirements.)"

Response-The Emergency Diesel Generator systems being provided to NSP will be located in a " mild environment" as defined in the diesel generator purchase specification M 870. The system components are supplied to the requirements of the purchase specification.

The mild environment is defined ar., an environment that would at no time be significantly more severe than the environment that would occur during. normal k plant operation, including anticipated operational occurrence.

The plant surveillance test program will address the vendor recommendations applicable to the equipment important to safety and located in a mild environment to ensure continued satisfactory performance.

The engine room design air temperature will range from +50 degrees F to +120 k degrees F. Ambient design outside air will range from .30 degrees F to +100 degrees F. The engine control room design air temperature will range from +50 degrees F to +104 degrees F.

The humidity design criteria for tu tarting air system is 100 percent relative humidity. The humidity deg.ign criteria for the remainder of the diesel generator equipment is 20 to 90 percent relative humidity, non-condensing.

Ouestion Number 4; *

"In regard to load capability testing you commit'to Reg. Cuide 1.108. There is no discussion or clear commitment on the test as per C.2.a 5 (i.e. restart from a hot engine condition.)"

Response!

The demonstration of " hot engine" restart capability is included in the Integrated Safeguards Pre-Operational-Test Program. The-diesel generator will be loaded and brought to a normal operating temperature, as defined by the lube oil and cooling water system temperatures.

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ran 3 of 4 Ouestion Number 5:

Appendix 2 of the licensee's submittal, Page 1 of 1, second paragraph, last sentence . What was the result of the review of the QA program and audit by Fluor Daniel, Inc. and NSP7

Response

The audit of SACM was performed to verify that SACM had a Quality Assurance program which met the criteria of 10CFR$0, Appendix B. Three findings were identified during the audit, these were in the following areas: identification and control of materials; corrective action; and traceability of measuring instruments to calibration standards. 'These findings were resolved satisfactorily by telecon and letter; compliance will be verified during the January 1990 audit. SACM's Quality Assurance program was found to be acceptable.

Question Number 6:

" Appendix 6, Page 2 of 2, last paragraph mentions the reliability of the SACM model UD45 engines but no value of the reliability is given (i.e. 95% or 99%?)*

Resnonse:

Based on the EdF, CRUAS reliability test results, a reliability factor of 1004 (zero fa*1ures in 1500 consecutive-start attempts) was achieved. This exceeds the present reliability standards of 994, based on the last 100 start attempts, or 954, based on the last 20 start attempts.

Question Number 7:

" Attachment 1, Page 10 of 10, subsection H requires more detail (i.e.'What was the improvemer.t; How much of an increase in reliability resulted?")

Response

The two modifications are discussed in the attached EdF report-(Attachment 2 and 3). The specific contribution of these two changes to the overall increased reliability is difficult to establish since no previous failures were attributed to either of these areas. The only data available is that the effectiveness of these changes were verified by a rigorous 1500. start test-program at the EdF CRUAS nuclear plant, w _

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, Ltr Datsd 12/1$/tp e res. 4 or 4 Ouestion Number 8:

" Appendix 7 Page 1 of 2, A. Pactory testing, - - Question regarding 146%

loading; How long was the 146% load applied and what was the basis for selecting the 146% of load? (i.e. Is it based on the maximum load capability of the engine or Benerator or a design basis?) The industry standard, maximum capability is 110% of generator nameplate for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

Resnonse:

The 146% value is based on the generator full load nameplate value. The duration of this peak value during the factory simulation of sequence step.

loading, was 1.5 seconds and occurred daring the final stage of the loading sequence.

Question Number 9:

" Appendix 9 subsection 2 - regarding torsional vibration last Paragraph, Page 5 of 6 What is the numerical salue for the acceptable limit? Do they meet the limits given in IEEE 387 Section 5.5?"

Response

The calculations of torsional vibration performed by the vendor, SACM, on the Prairie Island diesel generator sets (referred to in Attachment 1 Appendix 9 Page 6 of 6 of the 9/29/89 submittal) verified that no harmful torsional vibration occurs within plus or minus 10 percent of the idle speed, or within plus or minus 5 percent of the synchronous speed, as required per IEEE 387 1984, Paragraph 5.5.1.2.