ML20198D443
| ML20198D443 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 12/17/1998 |
| From: | Sorensen J NORTHERN STATES POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9812230088 | |
| Download: ML20198D443 (4) | |
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Northern States Power Company Prairie Island Nuclear Generating Plant
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December 17,1998 U S Nuclear Regulatory Commission Attn: Document Control Desk
'Nashington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos.50-2821.icense Nos. DPR-42 50-306 DPR-60 Follow Up to NSP Letter Dated December 10,1998:
Technical Specification Interpretation for Applicability of Quadrant Power Tilt Limits in the letter from Northern States Power Company (NSP) to the U.S. Nuclear Regulatory Commission (NRC), dated December 10,1998, NSP proposed that Prairie Island Nuclear Generating Phnt (PlNGP) Technical Specification TS.3.10.C be interpreted such that, at power levels less than 50% RTP, the Quadrant Power Tilt Ratio (QPTR) limits of this specification are not applicable. In subsequent conversation, the NRC requested a positive statement that the PINGP core analysis supports the conclusion that QPTR limits need not be applied at power levels less than 50%. The attached memo from NSP's Nuclear Analysis Department (the organization responsible for the PINGP core and transient analysis) provides this positive statement.
In this letter we have made no new Nuclear Regulatory Commission commitments.
Please contact Jeff Kivi (651-388-1121) if you have any questions related to this letter.
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Joel P. Sorensen Plant Manager hcp\\
Prairie Island Nuclear Generating Plant 9812230088 981217 i
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- .... s USNRC NORTHERN STATES POWER COMPANY December 17,1998 Page 2
. c: Regional Administrator - Region 111, NRC
' Senior Resident inspector, NRC NRR Project Manager, NRC J E Silberg Attachment i
follow up to CPTR Ts!.DX
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NSP Internal Correspondence from H O Nelson, NSP-Nuclear Analysis, to Jeff Kivi, Prairie Island, dated December 17,1998 I
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Int: mal Cortcspondanc3 oat. December 17",1998 From H O Nelson tocauon RSQ 10 To Jeff Kivi Location PING select Technical Specification Interpretation for Applicability of Quadrant Power Tilt Limits Nuclear Analysis and Design (NAD), which is the organization that has responsibility for Prairie island's core and transient analyses, has reviewed the proposed
" Technical Specification Interpretation for Applicability of Quadrant Power Tilt Limits" and concurs with the interpretation that the Quadrant Power Tilt Ratio (QPTR)
Technical Specification should not apply when the reactor is below 50% rated thermal power (RTP). The justification for and safety significance of the interpretation is based on the relevant section in the Prairie Island Technical Specifications and Standard Technical Specifications. This information clearly allows operation below 50% RTP while determining the cause of the tilt.
Nothing in any of the core or safety analyses for Prairie Island relies on limiting the OPTR below 50% RTP, Below 50% RTP there is either insufficient stored energy in the fuel or insufficient energy being transferred to the reactor coolant to require any limitations on QPTR. Therefore, the OPTR is not a concem for operation of the Prairie Island units below 50% RTP.
Thus, NAD concurs that the justification and safety significance supports the conclusion that the OPTR Technical Specifications do not apply below 50% RTP.
q H O Nelson I
Pi Project Manager Nuclear Analysis and Design ec:
Cliff Bonneau RSQ(10)
RO Anderson RSQ (8)
Tom Breens Pl