ML20248D338

Forwards Errata to Gc Creel Re Basis for Determination,Specifically Corrected Info Concerning Pressurizer Heater Sleeves

ML20248D338
Person / Time
Site:	Calvert Cliffs
Issue date:	09/29/1989
From:	Montgomery B BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 8910040204
Download: ML20248D338 (3)

Text

_ _ _ _ _ _ _ _ _ _ _ _

~

BALTIMORE GAS AND ELECTRIC CHARLES CENTER e P.O. BOX 1475

• BALTIMORE, MARYLAND 21203-1475 (301) 234-5000 NUCLEAR ENGINEERING SERVICES DEPARTMENT CALVERT CUFFS NUCLEAR POWER PLANT LUSBY MARYLAND 20657 September 29, 1989 U. S. Nuclear Regulatory dmmission Washington, DC 20555 ATTENTION:

Document Control Desk

SUBJECT:

Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Errata to Basis for Determination

REFERENCE:

(a) Letter from Mr. G. C. Creel (BG&E) to NRC Documerit Control

Desk, dated September 20,

1989, Submittal of Basis for Determination Gentlemen:

Appendix 1, " Materials Testing and Evaluation Report" to Reference (a) contained an error on page 7 of

14. The original ID of the pressurizer heater sleeves was specified to be 0.905 inch 0.0075 inch. The tolerance was incorrectly written as 0.075 inch in Reference (a). A corrected page 7 of 14 is enclosed. Please attach the enclosed page to the appropriate location in Reference (a).

We understand the importance of providing complete and accurate information and regret any inconvenience this may have caused. Should you have any further questions regarding this matter, we will be pleased to discuss them with you.

Very truly yours, i

N BSM/JMO/ dim Enclosure cc:

D. A. Brune, Esquire l

J. E.

Silberg, Esquire R. A.Capra, NRC g[

S. A.McNeil, NRC W. T. Russell, NRC

, t V. L. Pritchett, NRC T. Magette, DNR 8910040204 890929 PDR ADOCK 05000317 F

FDC

l

~

FABRICATION RECORDS

(

l Heater Sleeves I

A review of the fabrication records for Unit 1 and Unit 2 provides important information on the reaming operation for both Units. Heat treatment was not performed either on or in the immediate vicinity of the heater sleeves or J-groove welds.

It is likely welding resulted in slight distortion and/or weld intrusion that could have interfered with installation of the heaters.

The drawings specified that after welding the heater sleeves were to be reamed where necessary.

Records indicate that after welding all Unit I heater sleeves were reamed to permit passage of a 0.895 inch rod.

The original ID of the sleeves was specified to be 0.905 inch 1 0. 00 7 5 inch.Unreamed sleeves from the same heat had a measured ID of 0.900 inch.

There-(

fore, the reaming in Unit I would not have. required removal of a significant amount of material from an unwelded sleeve.

Records indicate that all heater sleeves in Unit 2 were reamed 3 1/2 inches from the top prior to welding.

The reamed diameter was

0. 913 inch, except for 7 sleeves which were inadvertently overreamed to diameters ranging from 0.918 to 0.928 inch.

These diameters were in good agreement with measurements in the reamed areas of heater I

sleeves removed for failure analysis.

Records indicate 118 heater sleeves in Unit 2 were also reamed or polished after welding.

Instrument Nozzles The Unit 2 pressurizer upper level nozzle at the 197 degree location leaked during shop hydro at 500 psi.

An investigation revealed slag inclusions in all Unit 2 upper instrement nozzle l

J-groove welds. These upper instrument nozzles were removed and the r

i Page 7 of 14

Docuraent Control Desk

+

' September 29, 1989 Page 2 bec:

G. V. McGowan C. II. Poindexter J. A. Tiernan/C. J. Franklin, Jr.

C. H. Cruse /A. R. Thornton Please be sure to route R. E. Denton/J. T. Carroll to your Alternate.

P. E. Katz/R. C. L. Olson C. C. Lawrence, III/M. J. Miernicki J. R. Lemons /R. F. Ash W. J. Lippold/B. S. Montgomery F. J. Munno/M. Gavrilas R. B. Pond /S. R.1;uxbaum T. N.

Pritchett/E.

I.

Bauereis L. B. Russell /R. P. Heibel M. E. Bowman R. M. Douglass J. M. Zupko, Jr.

J. 11. Walter R. C. DeYoung C. M. Rice R. G. Staker

.l.

J. Connolly G. J. Falibota D. L. Shaw, Jr.

M. L. Stone J. M. Osborne D. V. Graf B. C. Rudell

_ _ _ _ _ _ _ _ _ _ _. _ _ _ _.. _.. _ _ _ _ _ _ _ _ _ _ _ _ _. _ _ _ _ _ _ _