ML111230346

Discusses Items 1,2 & 5 in NRC 750523 Ltr Re Integrated Control Sys, safety-related Sys & Protection Against Loss of Reactor Coolant Flow Due to Electrical Grid Frequency Transients

ML111230346
Person / Time
Site:	Three Mile Island
Issue date:	12/30/1975
From:	Suhrke K Babcock & Wilcox Co
To:	Schwencer A Office of Nuclear Reactor Regulation
Shared Package
ML111230347	List: ML111230346
References
NUDOCS 7906290287
Download: ML111230346 (6)

Text

ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C. 20555 IE Circular No. 79-09 Date: June 22, 1979 Page 1 of 1 OCCURRENCES OF SPLIT OR PUNCTURED REG ULATOR DIAPHRAGMS IN CERTAIN SELF-CONTAINED BREATHING APPARATUS Description of Circumstances:

The Nuclear Regulatory Commission (NRC) has been informed by mailgram (copy enclosed) from the National Institute of Occupational Safety and Health (NIOSH) of the high rate of regulator diaphragm failures in the Scott Air Pak II/IIA and Presur-Pak II/IIA self-contained breathing apparatus. The failures, ranging from pin holes in-the diaphragm to complete diaphragm rupture, have been identified in about 10 percent of the units by the NIOSH field survey. Tests of the Scott apparatus by NIOSH showed reduced respiratory protection in the Demand-Mode and a loss of service time (but no loss of protection) in the Pressure Demand-Mode.

Notice to Licensees:

Many major-lic ensees use the types of Scott apparatus described above. Users of the devices should take the following action:

1.. Establish a program for examination of the described res piratory devices in accordance with the attached NIOSH mailgram; or

2. Incorporate the provisions of the NIOSH mailgram into your current program for inspection of the described devices.

No written response to this Circular is required. If you require additional information regarding this subject, please contact the individual specified in the attached mnailgram.

Attachment:

MAILGRAM 7 9 0 6290W

0 ENCLOSURE 2 IE Circular No. 79-09 Date: June 22, 1979 Page 1 of 3 LISTING OF IE CIRCULARS ISSUED IN LAST TWELVE MONTHS Circular Subject First.Date Issued To No. of Issue 78-12 HPCI Turbine Control 6/30/78 All Power Reactor Valve.Lift Rod Bending Facilities wi ,th an Operating License (OL) or Construction Permit (CP) having a HPCI Terry Turbine 78-13 Inoperability of 7/10/78 All Power Reactor Multiple Service Facilities with an Water Pumps OL or CP, except those located in: AL, AK, CA, FL, GA, LA, MS, SC 78-14. HPCI. Turbine Reversing 7/17/78 All Power Reactor Chamber Hold Down Facilities with an Bolting OL or CP having a HPCI Terry Turbine excepting Duane Arnold and Monticello 78-15 TiltingDisk Check 7/24/78 All Power Reactor Valves Fail to Close Facilities with an with Gravity in Vertical OL or CP Position 78-16 Limitorque Valve 7/26/78 All Power.Reactor Actuators Facilities with an OL or CP 78-17 Inadequate Guard 10/13/78 All Power Reactor Training/Qualification Facilities with an OL; and Falsified Training Susquehanna 1 & 2, Shoreham, Records and Salem 2

ENCLOSURE 2 IE Circular No. 79-09 Date: June 22, 1979 Page 2 of 3 LISTING OF'IE CIRCULARS ISSUED IN LAST TWELVE MONTHS Circular Subject First Date Issued To No. of Issue 78-18. UL Fire Test 11/6/78 All Power Reactor Facilities with an OL or CP 78-19 Manual Override (Bypass) 12/29/78 All Power Reactor of*Safety Systems Facilities with a Actuation Signals CP 79-01 Administration of 1/12/79 All Medical Licensees, Unauthorized Byproduct except Tel etherapy Material to Humans Medical Licensees, and all Licensed Radio pharmaceutical Distributors 79-02 Failure of 120 Volt 1/16/79 All Power Reactor Vital AC Power Supplies Facilities with an OL or-CP 79-03. Inadequate Guard 2/23/79 All Holders of and Trai ning/Qual ification Applicants for and Falsified Training Special Nuclear Records Material Licenses in Safeguards Group I 79-04 Loose Locking Nut on 3/16/79 All Power Reactor Limitorque Valve Facilities with an.

Operators OL or CP 79-05 Moisture Leakage in 3/20/79 All Power Reactor Stranded Wire Facilities with an Conductors OL or CP

ENCLOSURE.2 IE Circular No. 79-09 Date: June 22, 1979 Page 3 of 3 LISTING OF IE CIRCULARS ISSUED IN

.. LAST TWELVE MONTHS Circular Subject First Date Issued To No. of Issue 79-06 Fai'lure to Use-Syringe 4/19/79 All Holders of and Bottle Shields in Medical Licenses Nuclear Medicine Except.Tel etherapy Licenses.

79-07 Unexpected-Speed 5/2/79 All BWR Power Reactor Increase of Reactor Facilities with an Recirculation MG Set DL or CP Resulted in Reactor Power Increase 79-08 Attempted Extortion 5/18/79 All Fuel Facilities Low Enriched Uranium and Licensed Reactors

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• 1-0561bbU122014 05/02/79 ICS WA12139. wSHA.

Ob92 MLTN VA 05/02/79 MR JERRY CAPLIN US NRC WASHINGTON, DC 20555 RESPIRAJOR USERS WARNING THE NATIONAL INSTITUTE FOR OCCUPATIONAL SAFETY AND HEALTH CNIUSM.) WANTS TO ADVISE USERS*OF SCOTT AIR PAK hI/IA AND PRESUR-PAK hI/hA SLLF-CONTAINED BREATHING APPARATUS OF THE OCCUJRRENCES OF SPLIT OR PUNCTURED REGULATOR DIAPHRAGMS. NIOSH TEST-S INVESTlGATING THE EFFECT OF SUCH DEFECTS SHOW~ED REDUCED RESHIRAl URY PROTECTION ON DEMAND-MODE APPARATUS, THESE

= SAML TtSTS ALSO SHO~WED NO LOSS I-N PROTECTION, BUT A. LOSS IN SER'VICE TIME W.HEN IN TH-E PRESSURE DEMAND-MODE. NOTE: THE PREbSUNt DEMAND UNIT IS NOT APPROVED WHILE IN THE DEMAND MODE.; lAE DEMANLJ MODE IS TO BE USEU FOR DONNING PURPOSES ON LY, NIOSH bEGAN THIS INVESTIGAIION FOLLOWING THE RECENT DEATH OF THREE FIREFIGHTERS JmHO WERE REARING THIS TYPE OF RESPIRAJON, ALTHOUGH IT HAS NOT BEEN EST-ABLISHED THAT THE DEAIHS HEREH DUE TO DAMAGED REGULATOR DIAPHRAGMS. A SAMPLING OF THE APPARATUS 'IN THE FIELD HAS SHOHN AT LEAST

- 10% OF THE UNITS EXAMINED HAVE RUPTURED OR PUNCTURED

• DIAPHRAGMS, UbERS SHOULD EXAMINE THEIR SCOTT APPARATUS FOR POSSIBLE DAMAGED DIAPHRAGMS IN ACCOROANCE -WITH MANUFACTURER'S INSTRUCTIONS, THE USER SHOULD CHECK THE DIAPHkAGM BEFORE EACH USE bY CLOSING-BOTH THL MAIN LINE AND BYPASS VALVES AND BLO'WING THROUGH~ THE REGULATOR OUTLET PORT. IT SHOULD bE FOSSIOLE TO MAINTAIN A SLI.GHT POSITIVE PRESSURE IN THE REGULATOR. THE USER SHOULD) CHECK THE REGU'LATOR DIAPHRAGM AFTER EACH USE AND DURING MONTHLY INSPECTIONS O THE COMPLETE APPARATUS, IT IS NOT KNOWN IF FAILURE- OCCURS DURINU ASSL.M6LY, STOrkAGE, UR-USE OF.THE RESPIRATOR REGULATOR.

THEEFRE ETRMECAUSTION .MUST SE EMPLOYED P#HLN USING ME..RESPIRATOR. IN CHLCKING THE"OPERATION OF THE RESPIRATOR, USERS ARE CAUTIONED-NOT TO'BLOCK THE FLO"' OF Alk FROM THE REGULATUk WHMEN THE bYPASS VALVE IS OPEN, BECAUSE SUBSTANTIAL ObSTRUCTION MAY kUPTURE OR DISLODGE THE DIAPHRAGM. IF THE USER OvSERVLS A LOOSE OR DISLODGED REGULATOR COVER, THE COVER MUST 6ELPV AN ;TI;E;)APmRAUMFINbPJCTED EPORE REASSEMBLY, T k)IV'-

MAL A. EE SE F R WE ER UMCNS TOLL -FREE FCit~;~R

PAGE. 2 .- - 11T 617 SOF THE REGULATOR, NIOSH HAS REUUESTED THE MANUFACTURER STOP ALL SALES OF THE RESPIRATOR PENDING DETERMINATION OF THE REASON FOR AND NECE.SSA. Y CORRECTIVE ACTION TO PREVENT DIAPHRAG- FAILURE, FOR FURTHER ILCHNICAL INFOR~MATION CONTACT: MR, RICHARD RONK, NIOSHP 94 CHESTNUT RIDUE ROAD, MORGANTOWNP WY 26505.

PHONE: (-"-1 599-7337, ANTHONY ROBBINS, M.

DIRECTOR, NIUSH ROCKVILLE MD (ARS RUEVFCZ 0-26-01-036883) 21:19 LST MGMLUMP M(1 M