ML20024A135
| ML20024A135 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 06/03/1983 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Utley E CAROLINA POWER & LIGHT CO. |
| References | |
| NUDOCS 8306150464 | |
| Download: ML20024A135 (6) | |
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I DIST: Docket File NRC PDR LPDR SNorris DEisenhut BSiegel OELD ACRS-10 ASLAB Gray ORB #2 Rdg JHeltemes, AE0D ELJordan JMTaylor FEltawila SMacKay Docket Nos. 50-325/324 fir. E. E. Utley JUN 3 1983 Executive Vice President Carolina Power A Light Company P. O. Box 1551 Raleigh, North Carolina 27602
Dear Mr. Utley:
SUDJECT: IMK I C0HTAINPENT LONG TEPJ1 PROGRAM - PLANT UNIQUE ANALYSIS REPORT LOADS EVALUATION Re: Brunswick Stear' Electric Plant, Units 1 and 2 The HRC staff and its consultant Brookhaven National Laboratory (BNL) are reviewing the structural aspects of your plant unique analysis report. As a result of our review to date we have prepared the enclosed request for additional infomation.
To expedite this review it is requested that within three weeks of the date of this letter a neeting between the NRC and our consultants, and you and your contractor be held to discuss your response to these issues. Since it is our intent to resolve these issues at this necting, it is imperative that you have a representa-tive at this neeting that has the authority to make the decisions necessary to accomplish this coal.
It is suggested that this reeting be held at your contractors office; however, we are amenable to having it wherever it is rost convenient. Please notify your project nanager within seven days of receipt of this letter with a croposed recting date.
If you cannot neet the three week schedule, propose an alternative one.
This request for infomation was approved by the Office of flanagement and Budget under clearance nurber 3150-0091 which exoires October 31, 1985.
Si ncerely, ORIGIIIAL SIGNED BY 8306150464 830603 Donenic B. Vassallo, Chief PDR ADOCK 05000324 Operating Reactors branch #2 P
PDR Didsin of UWM
Enclosure:
As stated cc w/ enclosure See next page
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Mr. E. E, titley Carolina Power & Light Company Brunswick Steam Electric Plant, Units 1 and 2 cc:
Richard E. Jones, ' Esquire -
Dayne H. Browns, Chief Carolina Power & Light Company Radiation Protection Branch 336 Fayetteville Street Division of Facility Services Raleigh, Norts Carolina 27602 Department of Human Resources P. O. Box 12200 Georce F. Trowbridge, Esquire Raleigh, North Carolina 27605 Shaw, Pittman, Potts & Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 Mr. Charles R. Dietz Plant Manager P. O. Box 458 Southport, North Carolina 28461 Mr. Franky Thomas, Chairman Board of Com.issioners P. O. Box 249
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- - Bolivia, North Carolina 28422 Mrs. Chrys Baggett State Clearinghouse i
Budget & Management l
116 West Jones Street l
Raleigh, North Carolina 27603 l
l U. S. Environmental Protection Agency l
Region IV Office
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Regional Radiation Representative 345 Courtland Street, N. W.
Atlanta, Georgia 30308
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Resident Inspector U. S. Nuclear Regulatory Cor. mission P. O. Box 1057 Southport, North Carolina 28461 James P. O'Reilly Regional Administrator, Region II l
U.S. Nuclear Regulatory Commission l
101.'tarietta Street, Suite 3100 Atlanta, Georgia 30303 l
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REQUEST FOR ADDITIONAL INFORMATION FOR BRUNSWICK, UNITS 1 & 2 ITEM 1:
PUAR section 1.5 Justify the assumption that the unit S/RV forces and moments are ap-proximately the same as the unit pre-chugging forces and moments de-v, eloped by the asymmetric pre-chugging load.
Provide a comparison of the longitudinal distributions for both the unit S/RV and pre-chugging loads and discuss any available conservatisms which may offset the dif-ferences between the two distributions.
ITEM 2: PVAR section 2.2.1.2, AC section 2.7 Describe the alternate procedure used to calculate the pool swell im-pact and drag loads for structures located above the initial pool sur-face and below the maximum pool swell height.
Define the region where the alternate procedure was used.
Provide all pertinent documentation on the method used to develop the load definition for Brunswick from the Monticello test results and indicate why these pool swell profiles are a conservative representation for the Brunswick geometry.
In ad-dition, justify the use of the first set of pool swell profiles which were obtained in the Brunswick test using a wingless deflector in re-
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gions where no de'flector exists..
ITEM 3:
PUAR section 2.2.1.3, AC section 2.8 The OSTF plant-specific movies were utilized in the calculation of the froth im'pingement loads, as allowed by the AC, on the RHR test lines, RHR containment cooling line and the monorail.
Which OSTF tests were used? Describe how a conservative load specifiction was achieved and what uncertainty limits were applied as discussed in the AC.
Discuss in detail the method used to determine the froth source velocity.
Were Region II froth loads considered as part of the PUA?
ITEM 4:
PUAR section 2.2.2, AC section 2.13.8 The AC required that each licensee demonstrate that previously submit-ted pool temperature analyses are sufficient or provide plant-specific pool tenperature response analyses to assure that S/RV discharge trans-ients will not exceed the pool temperature limits specified in the AC as supplemented by NUREG-0783.
Provide sufficient information to sat-isfy the above requirement concerning the pool temperature evaluation including the maximum bulk pool temperature and maximum local pool tem-perature obtained for_ each SRV discharge transient considered.
In ad-dition, explain in detail and justify how the local-to-bulk pool tem-perature difference was determined.
ITEM 5:
PUAR section 2.2.2, AC section 2.13.8.3 The AC stipulates that the Suppression Pool Temperature Monitoring Sys-tem (SPTMS) is required to ensure that the suppression pool is within
. the allowable temperature limits set forth in the Plant Technical Spe-cifications.. Provide sufficient information to demonstrate that the Brunswick SPlMS design is in' accordance with the requirements of AC section 2.13.8.3..
ITEM 6:
PUAR section 2.2.2, AC section 2.13.7 During the discussion concer'ning the SRV load cases which are applic-able to Brunswick various load cases were eliminated by stating that these load cases were bounded by others, e.g., case A1.2(SBA) bounds A1.2(IBA), thus only A1.2(SBA) was analyzed.
Justify these statements by providing the results of the computer analyses which were performed or the reasons why various cases bound others.
ITEM 7:
PUAR section 2.2.2, AC section 2.13.7 The AC required that an asymmetric SRV discharge load case be con-sidered for both first and subsequent actuations with.the degree of
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asymmetric discharge for'each ' event combination being determined from a
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plant-specific primary system analysis designed to maximize the asym-metric condition.
No mention of an asymmetric SRV discharge load case 4
is made in the PUAR load case discussion.
Provide sufficient informa-tion to satisfy the AC requirements concerning this matter.
ITEM 8:
PUAR section 3.3.2.3, AC section 2.10.1 The equations presented in the PUAR for interpolating the vent header deflector forces at various Z/t's are not consistent with the AC.
l These equations utilized the longitudinal multiplier distribution from l
NED0-24612 and thus do not incorporate the AC specification that the three-dimensional load variation shall be based en the EPRI " main vent orifice" tests.
Describe in detail how the vent deflector forces were~ ~
calculated at'various Z/1's.
l Specify as part of your response which longitudinal 1
multipliers and set of equations were used in the interpolation proc-ess.
In addition, specify what the Z/t is for the typical pool swell impact and drag load given in Figure 3.3.2.3-1 of the PUAR.
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3-ITEM 9:
PUAR section 3.3.2.5, AC section 2.12.2 Describe what analyses were done to satisfy the AC,
- requirement for multiple downcomer chugging synchronization.
Indicate what exceedance probability was used to assess the statistical directional dependence and what the corresponding force per downcomer was.
ITEM 10:
PUAR section 1.3.4, AC section 2.13 Provide more detailed information concerning the T-quencher utilized in the Brunswick plants.
Specify any differences such as hole spac-ing, hole diameter, etc..between the Brunswick T-quencher and the T-quencher tested at Monticello.
ITEM 11:
PUAR section 2.2.1.8, AC section 2.14.8 4
Provide the details of a post chug submerged structure load calcula-4 tion for a given segment of a vent header support column.
Include numerical values of source strength and DLF as,,a, function of fre-quency.
In addition, provide the acceleration volume, drag coeffi-cient, interference effect multiplier and pertinent geometric param-eters and con. figuration used in the calculation.
j ITEM 12: AC section 2.1 Section 2.1 of the Acceptance Criteria states that "as part of the PUA, each licensee shall specify procedures (including the primary system parameters monitored) by which the operator will identify the SBA, to assure manual operation of the ADS within the specified time pe riod.
Longer time periods may.be assumed for the SBA in any spe-cific PUA, provided (1) the chugging load duration is correspondingly increased, (2) the procedures to assure manual operation within the assumed time period are specified, and (3) the potential for thermal I~
stratification and asymmetry effects are addressed in the PUA".
The PUAR does not specifically address the above requirement.
Cl a r-l ification is needed.
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ITEM 13:
Provide the impact / drag load transients used in the analysis of the main vent, vent header, vacuum breaker and downcomers.
In addition,
. provide the position of the maximum pool swell height and its relation to the main vent.
ITEM 14:
Provide the loads that were used in the torus attached piping.
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