ML20245K350
| ML20245K350 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 06/28/1989 |
| From: | Tam P Office of Nuclear Reactor Regulation |
| To: | Sieber J DUQUESNE LIGHT CO. |
| References | |
| IEB-88-011, IEB-88-11, TAC-71086, TAC-72111, NUDOCS 8907050102 | |
| Download: ML20245K350 (5) | |
Text
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June 28,1939 Docket No. 50-412 Mr. J. D. Sieber, Vice President Ddquesne Light Company Nuclear Group Post Office Box 4 Shippingport, Pennsylvania 15077
Dear Mr. Sieber:
SUBJECT:
BEAVER VALLEY UNIT 2 - REQUEST FOR SUFPORT DURING SITE AUDIT (TAC 71086 AND 72111)
The purpose of this letter is to confirm our plan to conduct a site audit on August 3-4, 1989, as part of our efforts to complete review of your submittals on thermal stratification of the pressurizer surge line. provides an outline of the audit activities.
Part of our discussion will center around the topical report WCAP-12093, " Evaluation of Thermal Stratification 'for the Beaver Valley Unit 2 Pressurizer Surge Line"; enclosure 2 delineates the WCAP-12093 issues we would like tu discuss.
The following persons will participate:
Shou-Nien Hou (reviewer) and Frank Vasiliadis (contractor).
Please ensure that persons knowledgeable about WCAP-12093, and pertinent support documents / calculations are available in the 4
audit. We will work with Mr. B. Sepelak of your staff on details.
Sincerely, b[
.>t 4-ed Peter S. Tam, Senior Project Manager Project Directorate I-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation
Enclosures:
As stated cc w/ enclosures:
See next page DISTRIBUTION JDocket' File -
PTam NRC & Local PDRs 0GC(info,only) 1 PDI-4 Reading EJordan SVarga BGrimes BBoger ACRS (10)
SNorris Shou
[BV-2 REQ /SUPPORTSITEMTG) gg LA:PDI-4 PM:PDI-4 D:
-4 4
SNo'his PTam:bd JSto z I
06/8/89 06/28/89 06d /89 f
8907050102 890628 PDR ADOCK 0500041' Q
PDC l
4 Mr. J. Sieber Beaver Valley Power Station Duquesne Light Company Units 1 & 2 cC*
Jay E. Silberg, Esquire Bureau of Radiation Protection Shaw, Pittnan, Potts and Trowbridge Pennsylvania Department of 2300 N Street, N.W.
Environmental Resources Washington, DC 20037 ATTN:
R. Janati Post Office Box 2063 Kenny Grada, Manager Harrisburg, Pennsylvania 17120 Nuclear Safety Duquesne Light Company Mayor of the Borrough of P. O. Box 4 Shippingport Shippingport, Pennsylvania 15077 Post Office Box 3 Shippingport, Pennsylvania 15077 John A. Lee, Esquire Ashley 'C. Schannauer Duquesne Light Company Assistant City Solicitor One Oxford Centre City of Pittsburgh 301 Grant Street 313 City-County Building Pittsburgh, Pennsylvania 15279 Pittsburgh, Pennsylvania 15219 W.F. Carmichael, Commissioner Regional Administrator, Region I Department of Labor U.S. Nuclear Regulatory Commission 1800 Washington Street East 475 Allerdale Road Charleston, West Virginia 25305 King of Prussia, Pennsylvania 19406 John D. Borrows Resident Inspector Director, Utilities Department U.S. Nuclear Regulatory Commissien Public Utilities Connission Post Office Box 181 180 East Broad Street Shippingport, Pennsylvania 15077 Columbus, Ohio 43266-0573 Director, Pennsylvania Emergency Management Agency Post Office Box 3321 l
Harrisburg, Pennsylvania 17105-3321 l
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AGENDA l
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NRC AUDIT OF BULLETIN 88-11 ISSUES AT BEAVER VALLEY 2 1.
Audit Discussion Items A.
Surge line inspection results and corrective actions
~
B.
NRC staff questions relate to WCAP-12093 (see attached question list)
C.
Interrelationship between efforts of Beaver Valley 2 and WOG II. Docuraent Review
)
l A.
Inspection reports and results j
B.
Surge line design drawings C.
Analyses supporting acceptability of corrective actions D.
Other relevant licensee or Westinghouse reports l
l III. Walkdown l
A.
Inspectionofsurgeline(inaccessible) i
Evaluation of Thornal stratification for BV-2 PSL Review of WCAP-12093 SECTION 1mD 1.
Need to review document SSDC 1.3 which defines thermal design transients for BV-2.
How was this updated to reflect a)
The monitoring data?
b) Trem which plants? c) was a combination of plants used or was one plant (worst case) only?
2.
/kTerAAy =Trg4sg -T ac, Why this does not agree for some events of tables 1-4,1-57 3.
What is the % difference or actual values for the pipe myt's at critical locations between analytical values and HFT7 4.
The licenses reported that "An additional conclusion from the heat transfer and stress analysis is that the steady state stratification stresses at points of maximum stress envelopes the peak transient stress, even in the case of a step change temperature."
What is the justification for this?
5.
In reference to figures 1-33,1-34, and 1-35 a) Where is location 17 b) Is this the worst case?
If yes, justify.
6.
Fig 1-35.
Why data for plant "B" were used instead of BV-2 data 7.
Section "Fa page 1-12.
What is the justification / basis for this?
8.
Figures 1-37,1-38.
How was this factor derived?
9.
Explain tables 1-14,1-15,1-16,1-17,1-18 a)How was this data derived and used? b) How do they relate to BV-2?
SECTION 2.D 1
1.
Figure 2-3 (Page 2-2) What is the significance of this model and how does this relate to BV-27 2.
Figure 2-4 What about the case of top-to-bottom 4T=320'F 3.
Need to review cases of thermal stratification which have been obtained by interpolation from the 11 cases run l
I I
i
)
Review of WCAP-12093 4.
Provide maximum values and locations for I
a) Displacements calculated vs. measured i
b) Reaction values c) stresses for ASHE III equations 9,10,11,12,13,14.
i I
Need to see comparison with/without stratification
]
'5.
Hod was the worst case (enveloped case) determined for film coefficients and fluid velocities?
6.
Need to review results of the flow model test which were used i
to establish the boundary conditions for striping effects.
7.
Figure 2-62,2-63.
Were these F.E. models based on specific
]
BV-2 input data or envelope parameters were used?
If.enve-lope parameters were used, what was the basis for that?
s.
Table 2-4 shows,6T=260*F.. What about sit =320*F7 i
l 9.
Table 2-5,2-6.
How are these values utilized in question ic l
above? Explain.
10.
Figure 2-45.
How wore the five local stress locations (for temperature gradient) and the eleven thermal transient load cases incorporated in this snalysis? a) enveloped?
b) actual cases c) applicability to BV-27 j
1 11.
Figure 2-59.
How were these results modified to be used for larger diameter and thicker wall pipes?
' EECTION 3.0 1.
Which are the five cases used?
How were these determined to be the worst case?
2.
Need to discuss the superposition technique on the stress component basis.
How were the " appropriate factors to ac-count for specific transients and load cases" determined?
3.
For which cases a) ASME III code stress indices were used?
b) P.E. stress concentration effects were utilized?
4.
Which 17 sections were evaluated for the usage factors?
How was it determined that these are the worst cases?
What are the values?
5.
At which location and for which load cases ASME III NB-3600 1
equation 10 was exceeded?
What was the value?
l 6.
At which location and for which load case ASME III NS-3600 i
equations 12 and 13 is maximum?
What is the value?
l 1
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