ML20128Q713
| ML20128Q713 | |
| Person / Time | |
|---|---|
| Site: | Surry, Turkey Point, 05000000 |
| Issue date: | 05/28/1980 |
| From: | Murphy C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Jordan E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML20126K036 | List: |
| References | |
| FOIA-85-301 IEB-79-14, NUDOCS 8507270038 | |
| Download: ML20128Q713 (6) | |
Text
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NUCLEAR REGULATORY COMMISSION o g a REGION 11 ok. 101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 MAY 2 81980 SSINS 6820 MEMORANDUM FOR: E. L. Jordan, Assistant Director for Technical Programs, Division of Reactor Operations Inspection, IE FROM: Charles E. Murphy, Chief, Reactor Construction and Engineering Support Branch, RII
SUBJECT:
PROPOSED REVISION TO IE BULLETIN 79-14 (AITS F02500134)b During inspections and evaluations of IE Bulletin (IEB) 79-14 for Surry Nuclear Plant Units 1 and 2 and Turkey Point Power Plant Units 3 and 4, it appears that the Resistance Temperature Detector (RTD) line off the reactor loop was excessively overstressed, where in some cases the stresses were approaching the ultimate. Apparently, the reason for the overstressing for the particular lines is because Surry and Turkey Point were designed under ANSI B31. 1 Code. ANSI B31.1 did not have a breakdown of the different types of class of piping as defined in the more modern ASME Section III Code. Small bore piping at the time ANSI B31.1 was employed was analyzed by a simplified method using hand calculations. As times changed and ASME Section - III was issued, a breakdown of class of piping was employed where they identified Class 1, 2 and 3 as safety related systems depending on the boundaries of the piping. ' Under ASME Section III all Class 1. piping above one inch in diameter of pipe is required to have a formal computerized stress analysis. Therefore, even-though at the time the RTD lines were analyzed, hand calculations were acceptable, they must now be dynamically analyzed by computer. Due to the commitments to reanalyze all lines for Surry and Turkey Point for IEB 79-14 this problem has emerged to be typical. It is the recommendation of Region II that IE Bulletin 79-14 be revised to include small bore piping under 2-1/2 inches in diameter when the piping was analyzed by hand calculations per ANSI B31.1 and can now be classified as a Class 1 piping under the new ASME Section III guidelines. I Revision 1, paragraph 1 of IEB 79-14 under Action to be Taken by Licensee l and Permit Holders states, "For older plants, where Category I requirements did not exist... utilizing piping 2-1/2 inches in diameter and greater, meets design requirements". This paragraph should be continued by adding "... and all safety related piping under 2-1/2_ inches in diameter that were CONTACT: A. R. Herdt 242-5539 1 1 h 8507270038 850618 PDR FOIA HERRMANB5-301 PDR - ~ m
lw q . MAY a 81980 designed _under ANSI B31.1 that would be categorized as Class 1 piping under ASME Section III which were originally hand calculated must be dynamically reanalyzed by computer". q v4 e Charles E. Mur'phy, Ch ur Reactor Construction and Engineering Support Branch cc: H. D. Thornburg, IE RONS Branch Chiefs, RI, RIII, RIV, RV RCES Branch Chiefs, RI, RIII, RIV, RV
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