ML20135E966
| ML20135E966 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 12/09/1996 |
| From: | Carns N WOLF CREEK NUCLEAR OPERATING CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| WM-96-0135, WM-96-135, NUDOCS 9612120267 | |
| Download: ML20135E966 (4) | |
Text
-
s WfdLF CREEK l
NUCLEAR OPERATING CORPORATION i
Neil S. " Buzz
- Carns Chairman, President and
(
Chief Executive Officer December 9, 1996 WM 96-0135 t
U.
S. Nuclear Regulatory Commission
)
ATTN: Document Control Desk Mail Station P1-137 Washington, D. C.
20555 l
\\
Reference:
- 1) Letter WM 95-0129, dated August 30, 1995, from N. S.
- 2) Letter dated October 10, 1996, from USNRC, to N.
S.
Carns, WCNOC l
Subject:
Docket No. 50-482: Response to Request for Additional Information, Second 10-Year Interval Inservice l
Inspection Program Plan and Associated Requests for Relief Gentlemen:
Reference 1 transmitted the Wolf Creek Generating Station, Second 10-Year Interval Inservice Inspection Program Plan. Reference 2 requested additional I
l information to support review of Reference 1.
This letter transmits the Wolf l
Creek Nuclear Operating Corporation (WCNOC) response to Reference 2.
The l
Attachment contains the details of WCNOC's response, i
If you should have any questions regarding this request, please contact me at l
(316) 364-8831, extension 4100, or Mr. Terry S. Morrill at extension 8707.
I Very truly yours,
)
9612120267 961209
=^2 PDR ADOCK 05000482 i
G PDR Neil S. Carns NSC/jad Attachment cc:
M. T. Anderson (INEL Research Center), w/a L. J. Callan (NRC), w/a W. D. Johnson (NRC), w/a J.
F. Ringwald (NRC), w/a J. C. Stone (NRC), w/a 120021 RO. Box 411/ Burhngton. KS 66839 / Phone: (316) 364 8831 An Equal Opportufuty Employer M F-HC VET
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i
., Attachment to WM 96-0135 Page 1 of 3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION t
The following information is provided in response to the Request for Additional Information on the Second 10-Year Interval Inservice Inspection (ISI) Program i
Plan dated October 10, 1996.
WCNOC was requested to confirm that the conditions stated below will be incorporated into the Second 10-Year ISI program for the referenced relief requests.
The requested conditions are discussed individually below.
Where the condition is noc being incorporated exactly as requested, I
WCNOC has provided additional clarification as to how the requested conditions will be incorporated into the Second 10-Year ISI Program.
Request Item A.
t Request for Relief. I2R-01, IWA-5242 (a), System Pressure Tests for Insulated j
Components:
l (1)
The licensee performs a
VT-2 visual examination of bolted j
connections, without' removing the insulation, af ter satisfying the requirements of IWA-5213, Test Condition Holding Time.
l (2)
The licensee shall remove all insulation at bolted connections in borated, systems during each refueling outage and perform a VT-2 j
visual examination; the connection is not required to be pressurized.
Any evidence of leakage shall be evaluated in l
accordance with IWA-5250.
Response to Item A.
Subitem (1) will be incorporated into Relief Request I2R-01 as requested.
The response to subitem (2) provides specific information regarding how the j
requested condition will be incorporated into Relief Request I2R-01.
i (1)
A VT-2 visual examination will be performed during each system j
pressure test, without removing insulation, after satisfying the-requirements of IWA-5213, Test Condition Holding Time.
(2)
Bolted connections in Reactor Coolant System piping subject to the pressure test at the completion of each refueling outage will be inspected with the insulation removed but is not required to have the' system at normal operating pressure.
Any evidence of leakage will be evaluated in accordance with IWA-5250.
)
When pressure testing piping systems that contain boron for the purpose of controlling reactivity, the insulation will be removed, on the same frequency as that required for performance of the i
pressure test, and VT-2 visually examined, without the system at normal operating pressure.
Any evidence of leakage will be evaluated in accordance with IWA-5250.
A i
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d E
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Attachmsnt to WM 96-0135 Page 2 of 3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION l
i Request Item H.
)
Request for Relief I2R-02, IWA-52 50 (a) (2), System Pressure Test Corrective.
]
Measures:
l' (1)
If the initial evaluation indicates the need for a more in-depth I
L evaluation, the bolt closest to the source of leakage shall be l
- removed, VT-1
- examined, and evaluated in accordance with IWA-3100 (a).
i i
I Response to Item B.
The requested condition will be incorporated into Relief Request I2R-02, l
including an ability to defer the requested visual examination. The following response refers to performance of a VT-3 verses the VT-1 contained in the request.
A VT-3 is specified to be consistent with the requirements of IWA-5250(a), which requires a VT-3 examination for corrosion.
When leakage is identified at bolted connections by VT-2 visual j
examination during system pressure testing, an evaluation will be l
performed as discussed in Relief Request I2R-02.
When the initial j
evaluation indicates that the bolting is. susceptible to corrosion or it is
)
determined that a more in-depth evaluation is necessary, the bolt closest J
to the source of leakage will be removed, VT-3 examined for corrosion, and i
l evaluated in accordance with IWA-3100(a),
l l
In addition, if the leakage is identified at a bolted connection that is I
in service and the evaluation supports continued service, the bolt removal j
and subsequent VT-3 may be deferred to the next component / system outage of sufficient duration.
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Request Item C.
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i Request for Relief I2R-12, Examination Categories C-F-1 and C-F-2, Items C5.12, C5.22, C5.42, C5.52, C5.62, and C5.82, Class 2 Longitudinal Piping Welds-(1)
For ferritic welds, scanning for reflectors transverse to the weld l
shall be performed.
1 (2)
Where the longitudinal weld cannot be identified, 100% of the circumferential weld shall be examined for flaws parallel and transverse to the weld to ensure that the
[
longitudinal /circumferential weld intersection is examined.
I Response to Item C.
4 The proposed alternative described by Relief Request I2R-12 shall not apply to ferritic piping.
Inservice Inspection of longitudinal welds in ferritic piping will continue to be performed in accordance with ASME Section XI requirements.
Therefore, the requested confirmation is not applicable.
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Attachment to WM 96-0135
, ' Page 3 of 3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION 1
Request Item D.
Request for Relief I2R-13, Table IWC-5250-1, Examination Category C-H, Items C7.30, C7.40, C7.70, and C7.80, Pressure Testing of Class 2 Components at i
Containment Penetrations:
(1)
The Appendix J, Type C test will be conducted at the peak calculated containment pressure.
I (2)
Where air or gas is used as a testing medium, the test procedure shall include methods for detection and location of through-wall leaks in system components.
i l
Response to Item D.
Subitem (1) will be - incorporated in.,o Relief Request I2R-13 as requested.
l However, additional clarification is provided regarding definition of peak l
l calculated containment pressure.
Subitem (2) will be incorporated into Relief j
i Request I2R-13 with additional clarification provided below, j
1 I
(1)
When Section XI pressure testing credit is to be taken for Appendix i
J, Type C tests, the peak calculated containment pressure as defined by the Technical Specifications will be used as the test pressure.
1 (2)
When Appendix J,
Type C testing of the containment penetration listed in Table I of IR2-13, and on the associated valves, results 1
I in identification of a 0 (zero) leak rate, ASME Section XI pressure testing requirements are satisfied.
However, when a leak rate is present and air or gas is used as the testing medium, the test procedure will include methods for detection and location of through-wall leaks when credit for ASME Section XI pressure test requirements is desired.
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