ML20247N020
| ML20247N020 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 04/27/1989 |
| From: | Chrzanowski R COMMONWEALTH EDISON CO. |
| To: | Olshan L Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20247N024 | List: |
| References | |
| NUDOCS 8908020264 | |
| Download: ML20247N020 (10) | |
Text
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.w p-g Q' commonwealth Edison:
, ./4 r'I Address 72 Wrst Adams Street, Chicago, Illinois Reply to: Post OfEe Box 767
~
., \L"'/ Chicago, Illinois 60690 0767 April 27,.1989 v
Mr. Leonard >!. Olshan Nuclear Reector Regulation U;-S. Nuclear Regulatory Commission Washington, DC',20555-
Subject:
Byron Station Units 1 and 2 Deep Well Request.for Additional-Information Response NRC Docket Nos. 50-454 and 50-455
~
. References- (a) April 13, 1989, P. Y. Chen Telecopy Dear Mr. Olshant The.f.esponse to Reference (a) is contained in the attachments to this lettier. Attachment A contains.the answers to questions 1 through 6.
Attachments B contains. maintenance information regarding the two deep well pumps. . Attachment C contains the requested vendor drawing information. Please direct any further questions on this matter to this office. Very truly yours, R. hrzanowski, Nuclear Licensing Administrator
/sc1:0099T 1~
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*' ATTACHMENT.A j
+
b lyron Station Seismic' Qualification of Deepwells
. Response'to NRC Request for Additional Information Request from P.Y. Chen (MEB).
s QgIstion'1 Provide the detailed drawings for the'following areast ~ a). Pump,. motor, and pipe connection, including the gap between the pump and. the'16" diameter casing. b) 8". diameter' discharge pipe (pump and motor portion) supports. Answer a) Drawing No. VW-N10-75.GG042 dated September 12, 1975, illustrates the general. construction details and the locations of the motor, pump and discharge' pipe relative to the casing. This drawing also reveals that the gap between the pump and the. casing is (15.25" - 10.5")/2 = 2.375" = 2-3/8". The gap between the motor and the casing is (15.25" - 13.56")/2
= 0.844" = 27/32".
b) Drawing No. 8-UK-2 dated October 1, 1975 Illustrates the connection between the discharge pipe as it clears the well shaft and the head
~ fitting. The well head fitting is welded to the well casing.
Qngstion 2 Why the nonlinear time history analysis had to be used? How are the results compared with those obtained from elastic response method. Anauer 1 The sole purpose of nonlinear time history analysis was to take into consideration l the gaps between the pipe-pump-motor and the well casing. The time history L, analysis considered linear elastic materials for the discharge pipe and the motor-pump segments. Onestion 3 Has the computer code NONLIN-2 been verified and benchmarked. AusMRI. r .Yes, the computer code NONLIN-2 is a Sargent & Lundy validated computer program. The program has been verified and benchmarked in accordance with the Sargent & Lundy General Office Procedure on this subject (GOP 4-1). i RAC/sc1:0099T:2 $l _:_=_ ____- _ _- _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - - _ _ - _ _ _ _ _ - - _ _ - _ _ _ _ - _ _ - _ _ _ _ _ - _ _ _ _ _ _ _ _ - _ _ _ _ _ - - _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _-____a
*- A22hgB(ENT A (contin odl 4QueltioA_i Have'the potential impacts due to a earthquake at the pump and motor area been considered? What are the results?
Answer The time history analysis takes into consideration the interaction between the casing and the pump-motor by the use of the gap-spring elements. The maximum forces obtained from this analysis also includes the impact effects. The forces for pump-motor impact with the casing are similar in magnitude to those for discharge pipe impact with the casing. Since the pump and motor are structurally rigid and of rugged construction, stresses in-these components will be less than the pipe stresses. Also, as noted in the report " Seismic Qualification of the Byron'Deepwells," SL-4492 Rev. 1, the literature review indicates that pumps and motors for other wells have been operable even after earthquakes much stronger than the Byron SSE. Thus, the pump and motor for the Byron deepwells will also be operable following the Byron postulated Safe Shutdown Earthquake, Question 5 Has the adequacy of the anchorage and connections at the areas described in. Item 1 been evaluated? Provide the results. AuswitI The pump, motor and discharge pipe have been provided by the pump vendor to resist dead loads.plus 16.7 kips downward thrust and 10.0 kips upward thrust. These thrust forces occur only during pump start-up and shutdown and are considerably larger than the maximum vertical seismic forces at these connections. The connection of the discharge pipe to the well head fitting, which is supported by the well casing, has been provided by the pump vendor to resist dead loads plus the start-up and shutdown thrust forces. These forces are larger than the dead weight plus seismic load case. Hence, the connection of the discharge pipe at the well head fitting are adequate. n Question 6 Although this deep well is not the same as " Deep Draf t Pump" as described in I.E. Bulletin 79-15, it is suggested that pertinent deficiencies in the Bulletin be considered for this pump. Answer The pumps maintenance history is contained in Attachment B. The pumps have been' inservice since 1975, but the breaker was installed in 1982. Since the breaker was installed, the pumps have: OA 21,775 hours OB 23,492 hours 4 The total operating time for each pump is approximately X2,000 hours. The pump manufacturer's data sheets are contained in Attachment C for your information. One change to note is that when the pump setting was deepened (see page 3-3 of the Byron Seismic Qualification of The Deep Well Report). The pumps lift capacity was increased by adding two stages for a total of 10 stages. RAC/sc1:0099T:3
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